Internal Hex, Internal Torx, External Hex, Hex, TX
Torx, Metric, AF, Imperial, SAE
5.5 mm, 7/16 ", 9/16 ", 5/8 ", 11/16 "
3/4, 1-1/2, 2-1/2, 3/8, 1/2
25.4, 38.1, 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