External Torx, External Hex, Internal Torx, Hex, TX
Imperial, AF, Torx, Metric, SAE
5/16 ", 3/16 ", 8 mm, 15 mm, 9/16 "
1, 3/4, 1-1/2, 2-1/2, 1/2
38.1, 9.53, 6.35, 19.05, 25.4
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide