Spring Lock Washer Finish Zinc Plated Material Steel For Screw Size 8 mm Inside Diameter 8.4 mm Outside Diameter 16.6 mm Maximum Thickness 2.29 mm Minimum Thickness 2.29 mm Color Silver Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C46 Thickness Tolerance +/-0.28 mm Package Quantity 200