Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, AF, Metric, Imperial, SAE
5/16 ", 7 mm, 33 mm, 36 mm, 11/16 "
6.35, 25.4, 12.5, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide