Steel: CrV50Bv30 45-47 HRC Chromium coating D1: 20 mm D2: 14.5 mm Length: 25 mm Hexagon socket wrenches "Delo Tekhniki" are made of chrome-vanadium steel using cold stamping with subsequent heat treatment. The socket wrenches are hardened and protected from corrosion by chromium coating. They can withstand high and prolonged loads. The hexagonal profile is the best for applying loads to the classic hexagonal fasteners. A special grooved pattern on the base of the socket wrench improves grip characteristics and prevents slipping in the hands. You can also purchase sets of 1/4" socket wrenches.