Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Torx, Metric, Imperial, SAE
5/16 ", 7/32 ", 13/16 ", 5/8 ", 3/16 "
6.35, 38.1, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide