Steel: CrV50Bv30 45-47 HRC Chroming D1: 14.5 mm D2: 12 mm Length: 25 mm Hexagon socket heads "Delo Tekhniki" are made of chrome-vanadium steel using cold stamping and subsequent heat treatment. The socket heads are hardened and protected from corrosion by chroming. They are not afraid of high and prolonged loads. The hexagon profile is the best in terms of applying loads to classic hexagon fasteners. The special ribbed texture on the base of the socket head improves grip characteristics and prevents slipping in hands. You can also buy sets of socket heads 1/4".