Wedge Lock Washer, Lock Washer Type Wedge Lock, Finish Delta Protect, Material Steel, For Screw Size M20, Inside Diameter 21.4 mm, Outside Diameter 30.7 mm, Assembly Thickness 3.4 mm, Assembly Thickness Tolerance +/-0.25 mm, Dimensional Standards DIN 25201, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness HRC46, System of Measurement Metric, Package Quantity 100