Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Imperial, Metric, SAE
15/16 ", 7/16 ", 5/8 ", 9/16 ", 9 mm
1, 1-1/2, 2-1/2, 3/8, 1/2
38.1, 9.53, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Oxide, Black Phosphate