External Torx, Internal Hex, External Hex, TX, Hex
Imperial, Metric, AF, Torx, SAE
5/16 ", 5/8 ", 3/16 ", 25 mm, 11/16 "
25.4, 38.1, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide