External Torx, Internal Hex, External Hex, Hex, TX
Imperial, Metric, AF, Torx, SAE
3/16 ", 5.5 mm, 7 mm, 5/8 ", 11/16 "
9.53, 25.4, 12.5, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide