Optimized for use with 3/8" drive impact wrenches drivers ratchets and adapters. Stamped and ink filled diameter markings are wear resistant. 6-Point design made with forged impact steel. Made for high torque applications. Non-slip hex geometry helps prevent socket and fastener rounding. Comes in PACKOUT organizer with clear top. Removable tray supports easy storage in tool chests. Meets ASME industry standards. Includes: 3/8" Universal joint. 3" Extension. 1/4" Hex to 3/8" Square socket adapter. Multiple SAE socket sizes.