External Hex, Internal Hex, Internal Torx, TX, Hex
Torx, Imperial, AF, Metric, SAE
3/16 ", 5/16 ", 5/8 ", 9/16 ", 11/16 "
38.1, 9.53, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide