External Hex, Internal Torx, External Torx, TX, Hex
Metric, AF, Imperial, Torx, SAE
5/8 ", 5 mm, 9/16 ", 3/16 ", 17 mm
9.53, 6.35, 12.5, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide