Lock Washer, Steel, Delta Protect Finish, Fits Bolt Sizes M18, Inside Dia. 19.5 mm, Outside Dia. 29mm, Thickness 3.4 mm, Thickness Tolerance +/- 0.25 mm, Rockwell Hardness Min. 46 HRC, Meets/Exceeds DIN 25201, Package Quantity 100. This item has been restricted from sale in the following state (s): []