Ring wrenches, continuous, inch sizes. Standards: ISO 691, ISO 7738, ISO 3318, ISO 1711-1 and DIN 3113. Material: high-alloy quality steel. Jaw position 15 with narrower head for better accessibility. Twelve-sided Dynamic Drive profile for longer life of screws and nuts. Ring edge 15 deflected for hand protection and better grip. Chrome plated and matte polished for high quality surface finish.