Internal Torx, External Hex, TX, Hex, External Torx
Imperial, AF, Torx, SAE, Metric
5/8 ", 5 mm, 9/16 ", 23 mm, 25 mm
1-1/2, 3/4, 1, 2-1/2, 3/8
6.35, 9.53, 19.05, 38.1, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide