Wedge Lock Washer, Lock Washer Type Wedge Lock, Finish Delta Protect, Material Steel, For Screw Size M20, Inside Diameter 0.84 in, Outside Diameter 1.21 in, Assembly Thickness 0.13 in, Assembly Thickness Tolerance +/-0.01 in, Color Silver, Dimensional Standards DIN 25201, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness HRC46, System of Measurement Metric, Package Quantity 4