SUMMARY

      This summary highlights some of the information in this document. It may not contain all of the information that is important to you. To understand the merger fully and for a more complete description of the terms of the merger agreement and the merger, you should read carefully this document, the documents we incorporate by reference and the full text of the merger agreement included as Annex A to this document. Please also read “Where You Can Find More Information.” We have included references to other portions of this document to direct you to a more complete description of the topics presented in this summary.

      Unless otherwise indicated, pro forma financial results presented in this document give effect to the completion of the merger.

The Companies

  National-Oilwell, Inc. (see page 24)

      The core focus of National Oilwell is to provide the oil and gas industry with the highest quality oilfield products and services. With over 200 worldwide manufacturing and service center locations, National Oilwell supplies customer-focused solutions to meet the quality, productivity and environmental requirements of the oil and gas industry.

      National Oilwell designs, manufactures and sells major mechanical components and integrated systems for both land and offshore drilling rigs. It manufactures complete land drilling and well-servicing rigs, the largest line of lifting and handling equipment in the oil and gas industry and a broad offering of downhole drilling motors and specialized drilling tools, and also provides supply chain services through its global network of distribution service centers located near major drilling and production areas worldwide.

  Varco International, Inc. (see page 24)

      Varco is a leading provider of highly engineered drilling and well-servicing equipment, products and services to the world’s oil and gas industry. Varco is also engaged in the design, manufacture, sale and rental of drilling and well-remediation equipment, and is engaged in the provision of technical services. Varco has a long tradition of pioneering many drilling and production innovations which have improved the efficiency, safety, cost and environmental impact of petroleum operations.

      Varco is a leading manufacturer and supplier of innovative drilling systems and rig instrumentation; oilfield tubular and sucker rod inspections and internal tubular coating techniques; drill cuttings separation, control and disposal systems and services; high pressure fiberglass tubulars; and coiled tubing and pressure control equipment for land and offshore drilling operations. Varco also provides in-service pipeline inspections and sells and leases advanced in-line inspection equipment to makers of oil country tubular goods.

The Merger

      Pursuant to the merger agreement, at the effective time of the merger, Varco will merge with and into National Oilwell, with National Oilwell surviving. As a result of the merger, each Varco stockholder will

      The merger agreement also provides that, effective as of the completion of the merger, National Oilwell’s certificate of incorporation will be amended to increase the number of authorized National Oilwell shares of common stock from 150 million to 500 million, to eliminate the class of special voting stock and to change the name of the company to National Oilwell Varco, Inc.

Reasons for the Merger

      The National Oilwell board believes that the merger will provide substantial strategic and financial benefits to the stockholders of National Oilwell and that the merger will allow National Oilwell and Varco to combine their resources to enhance their ability to provide oilfield products and services. In reaching its determination to approve the merger agreement and the merger, the National Oilwell board consulted with National Oilwell’s management, as well as its financial and legal advisors, and considered a variety of factors, a number of which are described in this document.

      The Varco board of directors believes that the merger will provide substantial strategic and financial benefits to the stockholders of Varco, and that the combination will create a stronger oilfield services company that is capable of creating more stockholder value than Varco could achieve on its own. Varco also believes that the combination of Varco and National Oilwell will allow Varco stockholders to participate in a larger, more diversified company that will accelerate both companies’ strategies to develop, enhance and commercialize products and services. In reaching its decision to approve the merger agreement and the merger, the Varco board of directors considered a variety of factors, a number of which are described in this document.

Recommendations to Stockholders

      National Oilwell’s board of directors believes that the merger is advisable and fair to and in the best interests of the National Oilwell stockholders and unanimously recommends that National Oilwell stockholders vote FOR the proposal to adopt the merger agreement. A vote FOR adoption of the merger agreement also constitutes a vote FOR each of the following:

      National Oilwell’s board of directors also unanimously recommends that the National Oilwell stockholders vote FOR the approval of the National Oilwell Varco Long-Term Incentive Plan, or the Long-Term Incentive Plan.

      As of the record date for the special meeting, approximately 2% of National Oilwell’s outstanding common stock was held by its directors and executive officers.

      Varco’s board of directors believes that the merger is advisable and fair to and in the best interests of the Varco stockholders and unanimously recommends that Varco stockholders vote FOR the proposal to adopt the merger agreement.

      As of the record date for the special meeting, approximately      % of Varco’s outstanding common stock was held by its directors and executive officers.

Opinions of Financial Advisors

      The opinions of National Oilwell’s and Varco’s financial advisors are attached to this document as Annexes B and C, respectively. We encourage you to read those opinions carefully in their entirety for a description of the assumptions made, procedures followed, matters considered and limitations on the review undertaken. Each opinion is directed to the applicable board of directors and does not constitute a recommendation to any stockholder as to any matter relating to the merger.

      Goldman, Sachs & Co., National Oilwell’s financial advisor, delivered its opinion to National Oilwell’s board of directors that, as of August 11, 2004 and based upon and subject to the factors and assumptions set forth therein, the exchange ratio pursuant to the merger agreement is fair from a financial point of view to National Oilwell.

      Citigroup Global Markets Inc., Varco’s financial advisor, delivered its opinion to the Varco board of directors on August 11, 2004 to the effect that, as of such date and based on and subject to various assumptions made, matters considered and limitations described in the opinion, the exchange ratio of 0.8363 of a share of National Oilwell common stock for each share of Varco common stock in the merger was fair, from a financial point of view, to the Varco stockholders.

The Special Meetings

      Where and when: The National Oilwell special stockholders meeting will take place at                     , Houston, Texas, on                     2004 at            a.m., local time.

      What you are being asked to vote on: At the National Oilwell meeting, National Oilwell stockholders will be asked to consider and vote on the following proposals:

      National Oilwell knows of no other matters that will be presented for consideration of its stockholders at the meeting.

      Who may vote: You may vote at the National Oilwell meeting if you owned National Oilwell common stock at the close of business on the record date,                     , 2004. On that date, there were                      shares of National Oilwell common stock outstanding and entitled to vote. You may cast one vote for each share of National Oilwell common stock that you owned on the record date.

      What vote is needed: The affirmative vote of the holders of at least a majority of the outstanding shares of National Oilwell common stock is required to adopt the merger agreement. The affirmative vote of at least a majority of the votes cast at the special meeting is required to approve the Long-Term Incentive Plan, provided the total votes cast represent over 50% of the outstanding National Oilwell shares entitled to vote on the proposal. The affirmative vote of the holders of at least a majority of the outstanding shares of National Oilwell common stock present in person or represented by proxy at the special meeting is required to adjourn the meeting.

      Where and when: The Varco special stockholders meeting will take place at                     , Houston, Texas, on                     , 2004, at       a.m., local time.

      What you are being asked to vote on: At the Varco meeting, Varco stockholders will be asked to consider and vote on the following approvals:

      Varco knows of no other matters that will be presented for consideration of its stockholders at the meeting.

      Who may vote: You may vote at the Varco meeting if you owned Varco common stock at the close of business on the record date,                     , 2004. On that date, there were                      shares of Varco common stock outstanding and entitled to vote. You may cast one vote for each share of Varco common stock that you owned on the record date.

      What vote is needed: The affirmative vote of the holders of at least a majority of the outstanding shares of Varco common stock is required to adopt the merger agreement. The affirmative vote of at least a majority of the shares of Varco common stock present in person or represented by proxy at the special meeting is required to adjourn the meeting.

Directors and Management of National Oilwell Following the Merger

      The merger agreement provides that National Oilwell will take all requisite action such that the board of directors of National Oilwell Varco, as of the effective time of the merger, will consist of 10 persons, including:

      Upon completion of the merger, Messrs. Miller and Guill will change the class of directors to which they are currently assigned. At the effective time of the merger, the composition of the classes of the board

      At the effective time of the merger, Mr. Lauletta, currently the Chairman and Chief Executive Officer of Varco, will become the Chairman of the Board of National Oilwell Varco; Mr. Miller, currently the Chairman, President and Chief Executive Officer of National Oilwell, will become the President and Chief Executive Officer of National Oilwell Varco; Joseph C. Winkler, currently the President and Chief Operating Officer of Varco, will become the Chief Operating Officer of National Oilwell Varco; and Clay C. Williams, currently the Vice President and Chief Financial Officer of Varco, will become the Vice President and Chief Financial Officer of National Oilwell Varco.

Overview of the Merger Agreement

      National Oilwell and Varco will complete the merger only if the conditions set forth in the merger agreement are satisfied or, in some cases, waived. These conditions include:

      Either National Oilwell or Varco may choose to complete the merger even though a condition to its obligations has not been satisfied if the necessary stockholder approvals have been obtained and the law allows it to do so.

      The merger agreement contains restrictions on the ability of National Oilwell and Varco to solicit or engage in discussions or negotiations with a third party with respect to a proposal to acquire a significant interest in National Oilwell’s or Varco’s equity or assets. Notwithstanding these restrictions, before their stockholders adopt the merger agreement, the merger agreement provides that under specified circumstances, if National Oilwell or Varco receives a proposal from a third party to acquire a significant interest in the company that the board of directors determines in good faith may reasonably be expected to lead to a proposal that is superior to the merger, National Oilwell or Varco, as applicable, may furnish nonpublic information to that third party and engage in negotiations regarding a transaction with that third party.

      The merger agreement may be terminated at any time prior to the completion of the merger, whether before or after the stockholder approvals have been obtained:

      If the merger agreement is terminated, either National Oilwell or Varco, in specified circumstances, may be required to pay a termination fee of $75 million to the other party or reimburse up to $5 million of the other party’s expenses.

Varco Stock Options, Deferred Stock Units and Employee Stock Purchase Plan (see page 69)

      In general, upon completion of the merger, options to purchase shares of Varco common stock will be converted into options to purchase shares of National Oilwell common stock and assumed by National Oilwell. The number of options and exercise prices will be determined by applying the conversion ratio pursuant to the merger agreement. In addition, some converted options will become fully vested and exercisable at the effective time of the merger. In addition, upon completion of the merger, each outstanding deferred stock unit of Varco, representing a right to acquire shares of Varco common stock, will be converted into deferred stock units of National Oilwell Varco, representing a right to acquire shares of National Oilwell Varco common stock appropriately adjusted by applying the conversion ratio pursuant to the merger agreement. Some of the converted deferred stock units will become fully vested as of the effective time of the merger. National Oilwell will assume the Varco equity participation plans at the effective time of the merger.

      Each outstanding purchase right under Varco’s employee stock purchase plan will be assumed by National Oilwell and converted into a right to purchase National Oilwell common stock in accordance with the merger agreement and the employee stock purchase plan. National Oilwell will assume Varco’s employee stock purchase plan at the effective time of the merger.

Interests of Certain National Oilwell and Varco Executive Officers and Directors in the Merger (see page 7)

      In considering the recommendations of the respective boards of directors of National Oilwell and Varco with respect to the merger, the stockholders of both companies should be aware that some of the executive officers and directors of National Oilwell and Varco have interests in the transaction that differ from, or are in addition to, the interests of that company’s stockholders generally. National Oilwell’s board of directors and Varco’s board of directors were aware of these interests and considered them, among other matters, when making their respective decisions to approve the merger agreement.

Risk Factors (see page 7)

      See “Risk Factors” for a discussion of factors you should carefully consider before deciding how to vote at your company’s special meeting.

Material Federal Income Tax Consequences (see page 7)

      It is generally expected that the merger will qualify as a tax-free reorganization within the meaning of the Internal Revenue Code. The consummation of the merger is conditioned on the receipt by each of National Oilwell and Varco of opinions from their respective counsel to the effect that the merger will so qualify. Neither National Oilwell nor Varco may waive these conditions to the merger after its respective stockholders have adopted the merger agreement unless further approval from its stockholders is obtained with appropriate disclosure.

      Assuming that the merger qualifies as a reorganization under the Internal Revenue Code, then in general, neither National Oilwell stockholders nor Varco stockholders who receive shares of National Oilwell common stock in exchange for their Varco common stock in the merger will recognize any gain or loss for U.S. federal income tax purposes as a result of the merger, except that a Varco stockholder will recognize gain or loss with respect to any cash received in lieu of a fractional share of National Oilwell common stock in the merger. Tax matters are very complicated, and the tax consequences of the merger to a Varco stockholder will depend on the facts of each holder’s own situation. For a description of the

Accounting Treatment (see page 8)

      National Oilwell will account for the merger using the purchase method of accounting. Under that method of accounting, the aggregate consideration that National Oilwell pays for Varco will be allocated to Varco’s assets and liabilities based on their fair values, with any excess being treated as goodwill. National Oilwell currently expects to record approximately $1,513.0 million of goodwill upon completion of the merger, but that estimate is subject to change based upon the final number of shares of National Oilwell common stock issued at the time of closing and the final valuation of Varco’s identified assets and liabilities.

Other Information Related to the Merger

      The merger is subject to antitrust laws. National Oilwell and Varco made the required filings with the Federal Trade Commission, or FTC, and the Antitrust Division of the Department of Justice, or DOJ, relating to the merger on September 10, 2004, but they are not permitted to complete the merger until the applicable waiting periods have expired or otherwise terminated. National Oilwell and Varco may be required to obtain additional regulatory approvals from various state and foreign authorities. While we expect to obtain all required regulatory approvals, we cannot assure you that these regulatory approvals will be obtained or that the granting of these regulatory approvals will not involve the imposition of conditions on the completion of the merger. These conditions could result in the conditions to the merger not being satisfied.

      The stockholders of Varco are being asked to adopt the merger agreement pursuant to which each share of Varco common stock (other than shares of Varco common stock held directly or indirectly by National Oilwell or Varco) will be converted into 0.8363 of one share of National Oilwell common stock. Consequently, such stockholders will no longer hold shares in Varco but will instead hold shares in National Oilwell and their rights as stockholders of National Oilwell will be governed by Delaware law, the amended and restated certificate of incorporation of National Oilwell and National Oilwell’s bylaws. There are various differences between the rights of Varco stockholders and the rights of National Oilwell stockholders.

      National Oilwell has agreed to file an application to have the shares of National Oilwell common stock issued in the merger listed on the NYSE, the approval of which is a condition to closing the merger. At the effective time of the merger, the name of the combined company will be National Oilwell Varco, Inc. and its shares will trade on the NYSE under the ticker symbol “NOV.”

      Neither National Oilwell stockholders nor Varco stockholders have appraisal rights under applicable law or contractual appraisal rights under Delaware law as a result of the merger.

National Oilwell Varco Long-Term Incentive Plan (see page 9)

      On September 13, 2004, National Oilwell’s board of directors approved the National Oilwell Varco Long-Term Incentive Plan, subject to approval of the plan by National Oilwell stockholders and to completion of the merger. The Long-Term Incentive Plan is intended, among other things, to help the combined company attract and retain directors and employees after the effective time of the merger and to encourage them to promote the growth and profitability of the combined company. The completion of the merger is not conditioned upon the approval of the Long-Term Incentive Plan.

Selected Historical Consolidated Financial Data of National Oilwell

      National Oilwell is providing the following information to aid in your analysis of the financial aspects of the merger. The following selected historical financial data for each of the years in the five year period ended December 31, 2003 has been derived from National Oilwell’s audited consolidated financial statements. The selected historical financial data for the six months ended June 30, 2004 and 2003 has been derived from National Oilwell’s unaudited consolidated financial statements. In the opinion of National Oilwell’s management, the unaudited consolidated financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the interim consolidated financial statements. Results for the interim periods are not necessarily indicative of the results to be expected for the full year.

      The information is only a summary. You should read it along with National Oilwell’s historical financial statements and related notes and the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in National Oilwell’s Annual Report on Form 10-K for the year ended December 31, 2003 and Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 on file with the Securities and Exchange Commission and incorporated by reference into this document. See “Where You Can Find More Information.”

Selected Historical Consolidated Financial Data of Varco

      Varco is providing the following information to aid in your analysis of the financial aspects of the merger. The following selected historical financial data for each of the years in the five year period ended December 31, 2003 has been generally derived from Varco’s audited consolidated financial statements. The selected historical financial data for the six months ended June 30, 2004 and 2003 has been derived from Varco’s unaudited consolidated financial statements. However, the revenue, operating profit and income from continuing operations information below for the three year period ended December 31, 2003 has been adjusted from the audited consolidated financial statements to reflect Varco’s rig fabrication business as a discontinued operation. These adjustments were disclosed in Varco’s Current Report on Form 8-K dated April 30, 2004. In the opinion of Varco’s management, the unaudited consolidated financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the interim consolidated financial statements. Results for the interim periods are not necessarily indicative of the results to be expected for the full year.

      The information is only a summary. You should read it along with Varco’s historical financial statements and related notes and the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in Varco’s Annual Report on Form 10-K for the year ended December 31, 2003 and Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2004 on file with the Securities and Exchange Commission and incorporated by reference into this document. See “Where You Can Find More Information.”

Selected Unaudited Pro Forma Condensed Combined Financial and Other Data

      The merger will be accounted for under the purchase method of accounting, which means that the assets and liabilities of Varco will be recorded, as of completion of the merger, at their fair values and added to those of National Oilwell.

      We have presented below selected unaudited pro forma condensed combined financial information that is intended to provide you with a better picture of what the businesses might have looked like had National Oilwell and Varco actually been combined. The unaudited pro forma combined balance sheet combines the historical consolidated balance sheets of National Oilwell and Varco as of June 30, 2004, giving effect to the merger as if it occurred on June 30, 2004. The unaudited pro forma combined statements of income combine the historical consolidated statements of income of National Oilwell and Varco for the year ended December 31, 2003 and the six months ended June 30, 2004, giving effect to the merger as if it occurred on January 1, 2003. The selected unaudited pro forma condensed combined financial information does not reflect the effect of asset dispositions, if any, or cost savings that may result from the merger.

      You should not rely on the selected unaudited pro forma condensed combined financial information as being indicative of the historical results that would have occurred had the companies been combined or the future results that may be achieved after the merger. The condensed combined financial information would have been different, perhaps materially, had the companies actually been combined during the period presented. The following selected unaudited pro forma combined financial information has been derived from, and should be read in conjunction with, the unaudited pro forma condensed combined financial statements and related notes included elsewhere in this document.

COMPARATIVE PER SHARE DATA

      The following table presents:

The pro forma amounts included in the table below are presented as if the merger had been effective for the periods presented, have been prepared in accordance with accounting principles generally accepted in the United States and are based on the purchase method of accounting. The pro forma amounts in the table below do not, however, give consideration to the impact, if any, of asset dispositions or cost savings that may result from the merger or any non-recurring charges directly attributable to the merger.

      You should read this table together with the historical consolidated financial statements of National Oilwell and Varco that are filed with the Securities and Exchange Commission and incorporated by reference into this document and the unaudited pro forma condensed consolidated financial statements and accompanying discussions and notes beginning on page 86 of this document. See “Where You Can Find More Information.” The pro forma amounts presented in the table below are presented for informational purposes only. You should not rely on the pro forma per share data as being indicative of actual results of the combined company had the merger occurred prior to the dates indicated below. The combined financial information as of and for the periods presented may have been different had the companies actually been combined as of or during those periods.