Square Nut, Material Grade/Class Not Graded, Material Steel, Finish Zinc Plated, Thread Size 3/8 In. -16, Square Height 1/4 in, Square Width 5/8 in, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Rockwell Hardness B68 - C32, Thread Type Coarse, Package Quantity 100. This item has been restricted from sale in the following state (s): []