External Hex, Internal Hex, External Torx, Hex, TX
Imperial, Torx, Metric, AF, SAE
5.5 mm, 3/16 ", 23 mm, 1-1/2 ", 11/16 "
19.05, 25.4, 38.1, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide