Steel: CrV50Bv30 45-47 HRC Chromizing Set composition: - Hexagonal extended sockets 1/2": 8, 9, 10, 11, 12, 13, 14, 15, 17 mm; - Metal socket rail. Hexagonal sockets "Delo Techniki" are made of chrome vanadium steel using cold stamping and subsequent heat treatment. The sockets are hardened and protected from corrosion by chromizing. They can withstand high and prolonged loads. The hexagonal profile is the best for applying loads to classical hexagonal fasteners. The extended shape of the socket allows working with fasteners on relatively high studs or with threaded parts of deep seating. The special ribbed texture on the base of the socket improves grip characteristics and prevents slipping in hands.