Open end angle 15° with a slimmer head for improved accessibility.Ring end angle 15° for knuckle clearance or better grip.5° action angle.Switch for quick change of right and left direction.Larger and bi-directional size marking for easy identification.Ratchet in the ring for high productivity application.12-point Dynamic-Drive™ profile provides longer life for screws and nuts.Chrome plated micro-matte finishing provides high quality surface.High-performance alloy steel.Standards: ISO 1711-1 and DIN 3113