Spring Lock Washer, Carbon Steel, Carbon Steel, Finish Zinc Plated, Fits Bolt Sizes 8mm, M8, Inside Dia. 8.4 mm, Outside Dia. 16.6 mm, Thickness 2.29 mm, Thickness Tolerance +/- 0.28 mm, Color Gray, Rockwell Hardness C46, Helps Prevent Loosening, For Use With Bolts, Package Quantity 200. This item has been restricted from sale in the following state (s): []