17W12504 Flat Washer, Flat Washer Type Standard, Material Nylon, Material Grade/Class Grade 2, Finish Plain, For Screw Size 1/2 in, Inside Diameter 0.516 in, Outside Diameter 1 1/4 in, Maximum Thickness 0.062 in, System of Measurement Inch, Minimum Thickness 0.062 in, Color Off-White, Pack Size Small Pack, Resistance Properties Abrasion Resistant, Thickness Tolerance +/-0.005 in, Package Quantity 20