Lock Washer, Internal Tooth, Type A, Phosphorus Bronze, Fits Bolt Sizes 5/16 In., Inside Dia. 0.320 In., Outside Dia. 0.594 In., Thickness 0.028 In., Rockwell Hardness C50, Meets/Exceeds ASME B 18.21. 1, Package Quantity 100. This item has been restricted from sale in the following state (s): []