External Hex, Internal Torx, TX, Hex, 6-Point
AF, Torx, Imperial, SAE, Metric
5/8 ", 3/16 ", 5.5 mm, 15 mm, 9 mm
25.4, 38.1, 12.5, 19.05, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphatized, Gun-metal, Oxidised, Black Phosphate, Black Oxide