• Acc. to DIN 3124, ISO 2725-1 • Square drive as per DIN 3120 - C 12.5, ISO 1174, with ball retaining groove • Hand-operated, knurled grip • GEDORE vanadium steel 31CrV3, polished, chrome-plated • Sizes 16, 18, 21 mm with hole drilled for tommy bar Ø 8 mm