Internal Torx, Internal Hex, External Hex, TX, Hex
Imperial, Metric, Torx, AF, SAE
5.5 mm, 11/16 ", 3/16 ", 5/8 ", 26 mm
1, 3/4, 2-1/2, 1-1/2, 1/2
9.53, 25.4, 19.05, 6.35, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Oxide, Black Phosphate