Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Imperial, SAE, Metric
3/16 ", 11/16 ", 18 mm, 5/16 ", 9/16 "
9.53, 38.1, 19.05, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate