Internal Hex, External Torx, External Hex, Hex, TX
Torx, AF, Imperial, Metric, SAE
5/16 ", 7/16 ", 7/32 ", 11/16 ", 9 mm
6.35, 12.5, 25.4, 19.05, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide