Lock Washer, External Tooth, 302 Stainless Steel, Finish Plain, Fits Bolt Sizes 1/2 In, Inside Dia. 0.512 In, Outside Dia. 0.898 In, Thickness 0.039 In, Thickness Tolerance 0.045 to 0.037 In, Color Silver, Rockwell Hardness B85 max, N/A, Meets/Exceeds ASME B 18.21. 1, Package Quantity 25. This item has been restricted from sale in the following state (s): []