Steel: CrV50Bv30 45-47 HRC Chroming Set composition: - Long inch hexagon heads: 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 15/32", 1/2"; - Metal strip for heads. Hex wrench heads "Dela Techniki" are made of chrome-vanadium steel using cold stamping and subsequent heat treatment. The wrench heads are hardened and protected from corrosion by chroming. They are not afraid of high and prolonged loads. The hex profile is the best option in terms of applying loads to classic hexagonal fasteners. The elongated shape of the wrench head allows working with fasteners on relatively high studs or with threaded parts of deep installation. A special ribbed coating on the base of the wrench head improves grip characteristics and prevents slipping in hands.