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 Resistant Vibration Resistant Rockwell Hardness HRC40 System of Measurement Metric Package Quantity 200