Lock Washer Lock Washer Type Wedge Lock Finish Zinc Plated Material Steel For Screw Size #8 Inside Diameter 0.175 in Outside Diameter 0.34 in Maximum Thickness 0.08 in Assembly Thickness 0.08 in Color Silver Material Grade/Class Case Hardened Pack Size Small Pack Resistance Properties Shock Resistant Vibration Resistant Rockwell Hardness HRC40 System of Measurement Inch Package Quantity 200