Internal Hex, Internal Torx, External Hex, TX, Hex
Torx, AF, Imperial, SAE, Metric
5/16 ", 5 mm, 7 mm, 23 mm, 1-1/2 "
3/4, 1, 1-1/2, 2-1/2, 1/2
19.05, 25.4, 38.1, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide