Internal Torx, External Hex, Internal Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
5/16 ", 5 mm, 26 mm, 1-1/2 ", 11/16 "
3/4, 1, 1-1/2, 2-1/2, 3/8
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Oxide, Black Phosphate