Lock Washer, Lock Washer Type Wedge Lock, Finish Delta Protect, Material Steel, For Screw Size 9/16 in, Inside Diameter 0.572 in, Outside Diameter 1.128 in, Maximum Thickness 0.175 in, Assembly Thickness 0.175 in, Color Silver, Material Grade/Class Case Hardened, Pack Size Small Pack, Resistance Properties Shock , Vibration , Rockwell Hardness HRC40, System of Measurement Inch, Package Quantity 100