Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, AF, Imperial, Metric, SAE
13/16 ", 3/8 ", 9/16 ", 5/16 ", 5/8 "
19.05, 25.4, 9.53, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide