Steel: CrV50Bv30 45-47 HRC Chromium plating D1: 20 mm D2: 22 mm Length: 38 mm "Delo Tekhniki" socket heads are made of chromium-vanadium steel using cold stamping with subsequent heat treatment. The heads are hardened and protected from corrosion by chromium plating. They can withstand high and long-lasting loads. Torx - a six-point profile in which the direction of force is distributed perpendicular to the contact patch surface, which quickly increases their area as the load increases and practically eliminates edge damage. Special knurled embossing on the base of the head improves gripping characteristics and prevents slipping in the hands. You can also buy a set of Torx socket heads.