Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
5 mm, 7/32 ", 6 mm, 5.5 mm, 5/16 "
3/4, 1-1/2, 2-1/2, 1/2, 3/8
38.1, 12.5, 19.05, 9.53, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate