External Hex, Internal Torx, Internal Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
15/16 ", 3/16 ", 5/16 ", 7/16 ", 1-1/2 "
9.53, 25.4, 19.05, 6.35, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide