Internal Torx, External Hex, Hex, TX, 6-Point
Imperial, Torx, Metric, AF, SAE
11/16 ", 13/16 ", 5/16 ", 5.5 mm, 23 mm
1, 1-1/2, 2-1/2, 1/2, 3/8
6.35, 19.05, 25.4, 38.1, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide