Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
5/8 ", 7/8 ", 10 mm, 26 mm, 1-1/2 "
3/8, 1/2, 1-1/2, 3/4, 1/4
38.1, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate