EXHIBIT 4.6 LETTER AGREEMENT 201 Main Street, Suite 3100 Fort Worth, Texas 76102 October 19, 2000 Lone Star Technologies, Inc. 15660 N. Dallas Parkway, Suite 500 Dallas, TX 75248 Attention: Mr. Robert F. Spears Vice President, General Counsel and...Lock-Up Agreement • October 20th, 2000 • Lone Star Technologies Inc • Steel pipe & tubes
