Steel: CrV50Bv30 45-47 HRC Chromium plating Set composition: - Extended hexagonal sockets 3/8": 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm; - Metal socket rack 976 113 . Hexagon socket wrenches "Delo Tekhniki" are made of chrome-vanadium steel through cold stamping with subsequent heat treatment. 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 extended shape of the socket wrench allows for working with fasteners on relatively high studs or with deep-seated threaded parts. The special knurled pattern on the base of the socket wrench improves grip characteristics and prevents slipping in hands.