Lock Washer, Steel, Delta Protect Finish, Fits Bolt Sizes 9/16", Inside Dia. 0.600", Outside Dia. 1.210", Thickness 0.130", Thickness Tolerance +/- 0.01", Rockwell Hardness Min. 46 HRC, Meets/Exceeds DIN 25201, Package Quantity 100. This item has been restricted from sale in the following state (s): []