Open end angle 15° with a slimmer head for improved accessibility.Ring end angle 15° for knuckle clearance or better grip.5° ratchet action angle.Ratchet swivel head in 180° with fixed steps in every 15°.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.Quicker turning of fastener from the ratcheting action.Standards: ISO 3318 and DIN 3113