Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, AF, Imperial, SAE, Metric
5.5 mm, 6 mm, 15/16 ", 13/16 ", 5/16 "
12.5, 25.4, 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