ISO 691, ISO 7738, ISO 3318, ISO 1711-1 and DIN 3113, material: high-performance steel alloy, U-shaped shank ensures greater comfort, 15° jaw position with thin head for improved accessibility, double hexagon with dynamic drive profile for longer service life of the screws and nuts, ring side 15° angled, larger size markings on both sides for easy identification, chrome-plated micro-mat design with high-quality surface, patented U-shape