External Hex, Internal Hex, Internal Torx, Hex, TX
AF, Metric, Imperial, Torx, SAE
8 mm, 10 mm, 5/16 ", 5/8 ", 11/16 "
1-1/2, 1, 2-1/2, 3/8, 3/4
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