Internal Hex, Internal Torx, External Hex, TX, Hex
Imperial, Metric, Torx, AF, SAE
7/16 ", 5/16 ", 5.5 mm, 9 mm, 1-1/2 "
3/8, 3/4, 1-1/2, 2-1/2, 1/2
6.35, 19.05, 9.53, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide