Internal Torx, External Hex, TX, Hex, External Torx
Imperial, AF, Metric, Torx, SAE
5.5 mm, 6 mm, 7/32 ", 13/16 ", 5/16 "
9.53, 6.35, 19.05, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide