Wedge Lock Washer, Lock Washer Type Wedge Lock, Finish Plain, Material Stainless Steel, For Screw Size M12, Inside Diameter 0.51 in, Outside Diameter 1 in, Assembly Thickness 0.12 in, Assembly Thickness Tolerance +/-0.01 in, Color Silver, Dimensional Standards DIN 25201, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness HRC52, System of Measurement Metric, Package Quantity 4