Ogee Washer Standard Cast Iron Finish Hot Dip Galvanized Fits Bolt Sizes 5/8 In Inside Dia 0.750 In Outside Dia 2.750 In Thickness 0.625 In Thickness Tolerance +/-0.03 In Color Silver Rockwell Hardness B156 max N/A Meets/Exceeds ASTM A47 Package Quantity 25