Internal Hex, Internal Torx, External Hex, Hex, TX
AF, Torx, Imperial, SAE, Metric
5/16 ", 5/8 ", 3/16 ", 11/16 ", 23 mm
25.4, 38.1, 9.53, 19.05, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide