Castle Nut, Finish Black Oxide, Material Steel, Material Grade/Class Grade 2H, Thread Size 1/2 In.-13, Hex Width 7/8 in, Hex Type Heavy Hex, Lock Type Slotted Castle, Dimensional Standards ASME B18.2.2, Material Quality Standards ASTM A1194 Gr.2H, System of Measurement Inch, Thread Direction Right Hand, Pack Size Small Pack, Package Quantity 5