Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, AF, Metric, SAE
14 mm, 5/16 ", 5/8 ", 11/16 ", 23 mm
38.1, 19.05, 9.53, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide