Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, SAE, Metric
7/16 ", 9/16 ", 7 mm, 5/16 ", 11/16 "
19.05, 38.1, 6.35, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide