Lock Washer, Internal Tooth, Steel, Zinc Plated Finish, Fits Bolt Sizes 3/8 In, Inside Dia 0.398 In, Outside Dia 0.747 In, Thickness 0.047 In, Rockwell Hardness C50, Application For Castings and Heavy Machinery, For Use With Heavy Bolts and Nuts, Meets/Exceeds ASME B 18.21. 1, Package 100. This item has been restricted from sale in the following state (s): []