Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, AF, Metric, Torx, SAE
5.5 mm, 3/4 ", 7/8 ", 11/16 ", 33 mm
3/8, 1-1/2, 1, 2-1/2, 1/2
9.53, 25.4, 6.35, 38.1, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide