Internal Torx, External Torx, External Hex, TX, Hex
Imperial, AF, Torx, SAE, Metric
4 mm, 7/16 ", 5.5 mm, 5/8 ", 5/16 "
1/4, 1-1/2, 2-1/2, 3/8, 3/4
6.35, 25.4, 9.53, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate