Internal Hex, External Hex, Hex, TX, External Torx
Imperial, Torx, AF, Metric, SAE
3/16 ", 7/16 ", 11/16 ", 9 mm, 23 mm
38.1, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide