' Lock Washer, Internal Tooth, Steel, Zinc Plated Finish, Fits Bolt Sizes #8, Inside Dia. 0.176", Outside Dia. 0.340", Thickness 0.023", Thickness Tolerance -0.006", Rockwell Hardness C40 to C50, Application Prevents Loosening, For Use With Machine Screws and Nuts, Meets/Exceeds ASME B18.21.1, Package Quantity 100 '