External Torx, Internal Hex, Internal Torx, TX, Hex
Imperial, AF, Torx, SAE, Metric
3/4 ", 5 mm, 9 mm, 11/16 ", 25 mm
1, 1/4, 1-1/2, 3/4, 2-1/2
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 Phosphate, Black Oxide