Steel: CrV50Bv30 45-47 HRC Chromizing D1: 12 mm D2: 17 mm Length: 30 mm Hexagonal socket wrenches "Delo Tehniki" are made of chrome-vanadium steel using the cold stamping method with subsequent heat treatment. The socket wrenches 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 classic hexagonal fasteners. The special textured surface on the base of the socket wrench improves grip characteristics and prevents slipping in hands. You can also purchase sets of 3/8" socket wrenches.