Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Imperial, Torx, AF, SAE
15/16 ", 7/8 ", 5 mm, 3/16 ", 5/8 "
6.35, 19.05, 38.1, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate