Insulated 1/2in Drive Hex Socket 7/16in. 3.63in OAL. Bit socket chrome-vanadium steel, forged, oil-hardened. 1000Volt rated.Insulated 1/2in Drive Hex Socket 7/16in. 3.63in OAL. Bit socket chrome-vanadium steel, forged, oil-hardened. 1000Volt rated.