Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Torx, Metric, AF, SAE
9/16 ", 3/16 ", 15 mm, 5/16 ", 25 mm
38.1, 9.53, 19.05, 12.5, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide