Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, Metric, Imperial, AF, SAE
7/8 ", 9 mm, 11 mm, 5/16 ", 11/16 "
38.1, 9.53, 19.05, 12.5, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate