Internal Torx, Internal Hex, External Hex, Hex, TX
AF, Torx, Imperial, Metric, SAE
5/8 ", 9 mm, 5/16 ", 9/16 ", 11/16 "
1-1/2, 3/4, 1, 2-1/2, 1/2
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide