Split Lock Washer, Extra Duty, Steel, Finish Plain, Fits Bolt Sizes 1/2 In, Inside Dia. 0.502 In, Outside Dia. 0.935 In, Thickness 0.162 In, Thickness Tolerance + 0.010 In, Color Black, Rockwell Hardness C38-46, N/A, Meets/Exceeds ASME B 18.21. 1, Package Quantity 50. This item has been restricted from sale in the following state (s): []