Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Imperial, Metric, SAE
9/16 ", 7/16 ", 8 mm, 5.5 mm, 9 mm
19.05, 6.35, 38.1, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide