Steel: CrV50Bv30 45-47 HRC Chrome-plating D1: 18 mm D2: 17 mm Length: 30 mm "Delo Tekhniki" hexagon socket wrenches are made of chrome-vanadium steel using the cold stamping method with subsequent heat treatment. The socket wrenches are hardened and protected from corrosion by chrome-plating. They can withstand high and prolonged loads. The hexagonal profile is the best in terms of applying loads to classic hexagonal fasteners. The special ribbed texture on the base of the socket wrench improves gripping characteristics and prevents slipping in the hands. You can also purchase sets of socket wrenches 3/8".