Internal Torx, External Hex, Hex, TX, External Torx
Torx, Imperial, AF, Metric, SAE
7/16 ", 5/16 ", 9/16 ", 5.5 mm, 5/8 "
6.35, 19.05, 25.4, 9.53, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide