External Torx, Internal Torx, External Hex, Hex, TX
Imperial, Metric, Torx, AF, SAE
5/16 ", 12 mm, 19 mm, 11/16 ", 26 mm
2-1/2, 1-1/2, 3/8, 3/4, 1
19.05, 6.35, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide