External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Imperial, Torx, SAE, Metric
5 mm, 11/16 ", 10 mm, 16 mm, 5/16 "
3/4, 1/4, 2-1/2, 3/8, 1/2
38.1, 9.53, 25.4, 6.35, 19.05
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide