Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, Torx, AF, Metric, SAE
7/16 ", 5/16 ", 9/16 ", 3/16 ", 9 mm
38.1, 19.05, 6.35, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide