Acc. to DIN 3113, Form A, ISO 3318, ISO 7738, Sizes 5 and 5.5 mm with hexagon ring, up from size 6 mm with UD profile, Chrome-vanadium steel 31CrV3, chrome-plated, Carefully forged and professionally machined, Ring: 10B0 offset from shaft, with UD profile for gentle transmission of force, Overloading indicated by deformation, The offset ring ensures a better grip on deep-seated or inset nuts or bolts, Top-grade industrial quality for the hardest of continuous use, * not standardised