Internal Torx, External Hex, Hex, TX, 6-Point
Imperial, Metric, AF, Torx, SAE
4 mm, 11/16 ", 5/16 ", 7/8 ", 34 mm
3/4, 1, 2-1/2, 1-1/2, 3/8
6.35, 12.5, 25.4, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide