Lock Washer, Carbon Steel, Carbon Steel, Finish Zinc Plated, Fits Bolt Sizes 10mm, M10, Inside Dia. 10.5 mm, Outside Dia. 16.6 mm, Thickness 2.95 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): []