External Hex, Internal Hex, External Torx, TX, Hex
Imperial, Metric, AF, Torx, SAE
5.5 mm, 11/16 ", 5/8 ", 7/16 ", 25 mm
19.05, 6.35, 38.1, 25.4, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate