Internal Torx, External Hex, TX, Hex, External Torx
AF, Metric, Torx, Imperial, SAE
3/16 ", 5/16 ", 25 mm, 34 mm, 11/16 "
1-1/2, 3/4, 1, 2-1/2, 3/8
38.1, 25.4, 6.35, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide