External Torx, Internal Torx, External Hex, TX, Hex
Metric, Imperial, Torx, AF, SAE
5/16 ", 5/8 ", 9/16 ", 3/16 ", 5.5 mm
25.4, 38.1, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide