External Torx, Internal Hex, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
5/16 ", 5/8 ", 11/16 ", 23 mm, 1-1/2 "
1/2, 3/4, 1, 1-1/2, 2-1/2
9.53, 25.4, 19.05, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate