Internal Hex, External Torx, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
7/16 ", 5/8 ", 36 mm, 32 mm, 9 mm
38.1, 12.5, 6.35, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide