Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Torx, Metric, SAE
5.5 mm, 5/16 ", 7/8 ", 5/8 ", 11/16 "
1, 1-1/2, 2-1/2, 1/2, 3/8
9.53, 6.35, 19.05, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide