Internal Hex, Internal Torx, External Hex, TX, Hex
AF, Imperial, Torx, SAE, Metric
5/8 ", 3/16 ", 5.5 mm, 16 mm, 11/16 "
3/8, 3/4, 1-1/2, 2-1/2, 1/2
19.05, 38.1, 25.4, 12.5, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate