Internal Hex, External Hex, Internal Torx, TX, Hex
AF, Metric, Imperial, Torx, SAE
9 mm, 34 mm, 35 mm, 23 mm, 32 mm
1-1/2, 1, 3/4, 2-1/2, 3/8
38.1, 19.05, 9.53, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide