Lock Washer, 316 Stainless Steel, Plain Finish, Fits Bolt Sizes 1/4", Inside Dia. 0.280", Outside Dia. 0.450", Thickness 0.090", Thickness Tolerance +/- 0.01", Rockwell Hardness Min. 52 HRC Case Hardened, Meets/Exceeds DIN 25201, Package Quantity 200. This item has been restricted from sale in the following state (s): []