Lock Washer Lock Washer Type Wedge Lock Finish Zinc Plated Material Steel For Screw Size 3 mm Inside Diameter 3.81 mm Outside Diameter 8.6 mm Maximum Thickness 2.03 mm Assembly Thickness 2.03 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