Lock Washer, Lock Washer Type Wedge Lock, Finish Plain, Material Stainless Steel, For Screw Size 20 mm, Inside Diameter 20.82 mm, Outside Diameter 35.1 mm, Maximum Thickness 4.65 mm, Assembly Thickness 4.65 mm, Color Silver, Material Grade/Class Not Graded, Pack Size Small Pack, Resistance Properties Shock , Vibration , Rockwell Hardness HRC25, System of Measurement Metric, Package Quantity 100