Used throughout industry and the automotive world, Acc. to DIN 3122, ISO 3315, With square coupler, medium-fine toothed, extremely rugged, Return angle 9B0, For hand-operated sockets and accessories with square drive as per DIN 3120 - D 25, ISO 1174, with locking pin, For hand-operated sockets and accessories with square drive as per DIN 3120 - D 25, ISO 1174 with locking pin, Vanadium steel 31CrV3, chrome-plated