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