Thick Washer Flat Washer Type Oversized Material Steel Material Grade/Class Grade 8 Finish Zinc Yellow For Screw Size 1/2 in Inside Diameter 0.531 in Outside Diameter 1 1/16 in Maximum Thickness 0.203 in System of Measurement Inch Minimum Thickness 0.203 in Pack Size Small Pack Rockwell Hardness C43 Thickness Tolerance +0.005/-0.013 in Package Quantity 50