Steel: CrV50Bv30 45-47 HRC Chromizing D1: 13 mm D2: 12 mm Length: 25 mm "Delo Tekhniki" hexagonal socket wrenches are made of chrome-vanadium steel using the cold stamping method with subsequent heat treatment. The socket wrenches are hardened and protected from corrosion with chromizing. They can withstand high and prolonged loads. The hexagonal profile is the best in terms of applying loads to classic hexagonal fasteners. The special knurled pattern on the base of the socket wrench improves grip characteristics and prevents slipping in hands. You can also purchase sets of 1/4" socket wrenches.