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: 15° offset from shaft, with UD profile for gentle transmission of force, Overloadin