Acc. to DIN 3113, Form A, ISO 3318, ISO 7738, Chrome-vanadium steel 31CrV3, chrome-plated, Carefully forged and professionally machined, Slim jaw and jaw walls make this spanner lighter overall, Jaw: ground precisely to exact nominal size for optimum contact areas, Ring: 15B0 offset from shaft, with UD profile for gentle transmission of force, Overloading indicated by deformation, Secure grip thanks to hollow shaft - very ergonomic and handy, Glare-free look due to matt chrome, Designed for universal use, Top-grade industrial quality for the hardest of continuous use, Size 3 to 5.5 with hexagonal ring, from 6mm with UD profile, * not standardised