Steel: CrV50Bv30 45-47 HRC Chromium plating D1: 22 mm D2: 20 mm Length: 64 mm "Delo Tekhniki" hexagonal socket wrenches are made of chrome-vanadium steel using cold stamping and subsequent heat treatment. The socket wrenches are hardened and protected against corrosion by chromium plating. They can withstand high and prolonged loads. The hexagonal profile provides the best load application for classic hexagonal fasteners. The extended shape of the socket wrench allows for working with fasteners on relatively high studs or deep-seated threaded parts. The special knurled pattern on the base of the socket wrench improves grip characteristics and prevents slipping in the hands. You can also purchase sets of extended socket wrenches 3/8".