Acc. to DIN 3113, Form B, ISO 3318, ISO 7738, 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, Glare-free appearance due to matt chrome, Jaw: ground precisely to exact nominal size for optimum contact areas, Slim ribbed open end for added strength guarantees maximum torques