Internal Torx, Internal Hex, External Hex, TX, Hex
Metric, AF, Torx, Imperial, SAE
13 mm, 5.5 mm, 11 mm, 9/16 ", 11/16 "
3/8, 1/4, 2-1/2, 1/2, 3/4
12.5, 6.35, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Oxide, Black Phosphate