Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, AF, Torx, SAE, Metric
13/16 ", 5/16 ", 3/16 ", 11 mm, 36 mm
38.1, 6.35, 9.53, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide