External Torx, Internal Torx, External Hex, Hex, TX
Metric, AF, Imperial, Torx, SAE
7/16 ", 7/8 ", 12 mm, 9/16 ", 11/16 "
3/4, 1-1/2, 2-1/2, 3/8, 1/2
38.1, 9.53, 6.35, 25.4, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide