Internal Hex, Internal Torx, External Hex, TX, Hex
Metric, Torx, AF, Imperial, SAE
5/8 ", 5.5 mm, 14 mm, 7/16 ", 9/16 "
1, 1-1/2, 2-1/2, 3/8, 3/4
9.53, 25.4, 6.35, 12.5, 38.1
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate