Fender Washer Standard 316 Stainless Steel Finish Plain Fits Bolt Sizes 5/16 In Inside Dia 11/32 In Outside Dia 1 1/4 In Thickness 0.050 In Thickness Tolerance +/-0.010 In Rockwell Hardness B80 For Use With Screws and Studs Package Weight 0.90 Lbs Package Quantity 10