Internal Torx, External Hex, TX, Hex, External Torx
Imperial, Metric, AF, Torx, SAE
5/16 ", 5/8 ", 7/8 ", 8 mm, 1/2 "
19.05, 25.4, 6.35, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide