Internal Torx, Internal Hex, External Hex, Hex, TX
Metric, Torx, Imperial, AF, SAE
4 mm, 9/16 ", 7/16 ", 9 mm, 5/16 "
3/8, 3/4, 1/2, 1/4, 1-1/2
38.1, 25.4, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide