Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, Torx, Metric, AF, SAE
3/16 ", 10 mm, 5/16 ", 7/16 ", 11/16 "
12.5, 25.4, 6.35, 9.53, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide