Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
9/16 ", 3/16 ", 13 mm, 5/8 ", 11/16 "
3/8, 1/4, 1-1/2, 2-1/2, 1/2
38.1, 6.35, 19.05, 9.53, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate