Internal Torx, External Hex, Hex, TX, 6-Point
Imperial, AF, Torx, SAE, Metric
5/8 ", 7/8 ", 9/16 ", 12 mm, 23 mm
38.1, 25.4, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide