Internal Torx, External Hex, TX, Hex, External Torx
Imperial, Torx, AF, Metric, SAE
5/16 ", 5/8 ", 7/8 ", 9/16 ", 1-1/2 "
3/4, 1/4, 1-1/2, 2-1/2, 1/2
38.1, 19.05, 6.35, 12.5, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide