Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, AF, Torx, SAE, Metric
7/16 ", 11 mm, 11/16 ", 5/8 ", 5/16 "
38.1, 19.05, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide