Internal Torx, External Hex, Hex, TX, External Torx
Metric, Torx, AF, Imperial, SAE
3/16 ", 18 mm, 5/16 ", 1/2 ", 5/8 "
1, 3/4, 1-1/2, 2-1/2, 1/2
38.1, 9.53, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide