Lock Washer, Lock Washer Type Wedge Lock, Finish Delta Protect, Material Steel, For Screw Size 6 mm, Inside Diameter 6.66 mm, Outside Diameter 12.6 mm, Maximum Thickness 3.22 mm, Assembly Thickness 3.22 mm, Color Silver, Material Grade/Class Case Hardened, Pack Size Small Pack, Resistance Properties Shock , Vibration , Rockwell Hardness HRC40, System of Measurement Metric, Package Quantity 200