Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, SAE, Metric
9 mm, 5.5 mm, 13 mm, 7 mm, 12 mm
3/4, 1, 2-1/2, 1-1/2, 1/4
19.05, 6.35, 38.1, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide