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