Tool Steel Service of California, Inc. is a premier distributor of tool steel products. We specialize in supplying high quality Tool Steel Rounds, Drill Rod, Precision Ground Flat Stock, and Decarb Free Tool Steel Flats. We stock a large variety of tool steel grades, shapes, and sizes. We carry the following grades of tool steel: 4140 Annealed, 4140 Heat Treated, A2, D2, H13, O1, S7, and W1. All of our products are manufactured to industry specifications, and are subject to strict quality control procedures in order to maintain and exceed industry standards. If you can’t find what you need on our site contact us at 1-888-866-5911 or e-mail us.