Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Metric, Torx, Imperial, SAE
7/16 ", 5/8 ", 9/16 ", 11/16 ", 23 mm
12.5, 6.35, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide