WHOLESALE Chrome vanadium steel construction. Chamfered ends for fast, precise insertion and reducing stripping the fasteners. Contents: 6pc 3/8" DR.ST-40, ST-45, ST-47, ST-50, ST-55, ST-60. 6pc 1/4" DR. ST-10, ST-15, ST-20, ST-25, ST-27, ST-30.1pc 3/8" DR. (F) 1/4" DR. (M) Reducer. 2pc storage rack.Illinois Industrial Tool Professional series tools ⚠ WARNING: This product can expose you to Chromium, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.