Lock Washer, 316 Stainless Steel, Plain Finish, Fits Bolt Sizes 1", Inside Dia. 1.100", Outside Dia. 1.540", Thickness 0.130", Thickness Tolerance +/- 0.01", Rockwell Hardness Min. 52 HRC Case Hardened, Meets/Exceeds DIN 25201, Package Quantity 50. This item has been restricted from sale in the following state (s): []