External Hex, Internal Torx, Internal Hex, Hex, TX
Imperial, AF, Metric, Torx, SAE
5 mm, 12 mm, 3/16 ", 11/16 ", 25 mm
38.1, 25.4, 9.53, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide