Steel: CrV50Bv30 45-47 HRC Chromium plating D1: 12 mm D2: 12 mm Length: 25 mm Hexagon socket wrenches "Delo Tekhniki" are made of chromium-vanadium steel by cold stamping with subsequent heat treatment. The socket wrenches are hardened and protected from corrosion by chromium plating. They can handle high and prolonged loads. The hexagonal profile is the best in terms of applying loads to the classic hexagonal fastener. A special rifled groove on the base of the socket head improves gripping characteristics and prevents slipping in hands. You can also purchase sets of 1/4" socket wrenches.