Internal Torx, External Torx, External Hex, Hex, TX
Imperial, Torx, AF, Metric, SAE
5/16 ", 7/8 ", 13 mm, 5/8 ", 11/16 "
1/2, 1, 1-1/2, 2-1/2, 3/4
19.05, 12.5, 38.1, 6.35, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide