Thick Fender Washer Flat Washer Type Oversized Material Steel Material Grade/Class Grade 2 Finish Zinc Plated For Screw Size 1 1/4 in Inside Diameter 1.375 in Outside Diameter 3 1/4 in Maximum Thickness 0.5 in System of Measurement Inch Minimum Thickness 0.5 in Color Silver Inside Diameter Tolerance +/-0.010 in Outside Diameter Tolerance +/-0.010 in Pack Size Small Pack Rockwell Hardness B55 Thickness Tolerance +/-0.050 in