Steel: CrV50Bv30 45-47 HRC Chromium plating Set composition: - inch hexagonal sockets: 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 15/32", 1/2"; - metal socket rail. Hexagonal socket wrenches "Dela Tekhniki" are made of chrome-vanadium steel by cold stamping method with subsequent heat treatment. The socket wrenches are hardened and protected from corrosion by chromium 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 grip characteristics and prevents slipping in hands.