This Teng Tools Socket is a professional, 3/8 inch drive regular 6 point metric socket, produced in accordance with ISO 9000 and AS954 specifications. It provides excellent torque and reduces the risk of rounding fasteners. This socket has a stepped collar on the shank and is of the hexagonal variety. The socket is manufactured from chrome vanadium steel with a satin finish.The TENM380520 Hex Socket has the following specifications: Size: 20mm. Overall length: 29mm.