External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Torx, Imperial, SAE, Metric
5/16 ", 5/8 ", 9 mm, 7 mm, 11/16 "
3/4, 1-1/2, 1/4, 2-1/2, 1/2
6.35, 19.05, 9.53, 38.1, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide