Internal Hex, Internal Torx, External Hex, Hex, TX
Imperial, Metric, Torx, AF, SAE
8 mm, 5 mm, 7/16 ", 9/16 ", 36 mm
6.35, 19.05, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide