Fender Washer Flat Washer Type Oversized Dimensional Standards ASME B18.21.1 Material Stainless Steel Material Grade/Class 316 Finish Plain For Screw Size 1/4 in Inside Diameter 0.281 in Outside Diameter 1/2 in Maximum Thickness 0.047 in System of Measurement Inch Minimum Thickness 0.047 in Pack Size Small Pack Package Quantity 50