Internal Torx, External Torx, External Hex, Hex, TX
Imperial, AF, Torx, SAE, Metric
4.5 mm, 7/16 ", 5/8 ", 5/16 ", 11/16 "
38.1, 6.35, 19.05, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate