Acc. to DIN 3113, Form A, ISO 3318, ISO 7738, Vanadium steel 31CrV3, chrome-plated, Carefully forged and professionally machined, Slim jaws and slender jaw walls make the spanner lighter overall, Overloading indicated by deformation, Secure grip thanks to hollow shaft - very ergonomic and handy, Glare-free appearance due to matt chrome, Carefully forged and professionally machined, Jaw: ground precisely to exact nominal size for optimum contact areas, Ring: 15B0 offset from shaft, with UD profile for gentle transmission of force, Extra long shaft for deep range of use and more torque