Universal use in industry and automotive industry. Execution according to DIN 3122, ISO 3315. With punch square, medium fine tooth cut and robust. Recall angle 10 degrees. For hand-operated socket wrenches and fittings with square drive, in accordance with DIN 3120 - D 20, ISO 1174, with ball lock. GEDORE vanadium steel 31CrV3, chrome plated.