Internal Hex, External Hex, TX, Hex, 6-Point
AF, Imperial, Torx, SAE, Metric
5/16 ", 7/32 ", 5/8 ", 5 mm, 35 mm
25.4, 9.53, 19.05, 12.5, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphatized, Oxidised, Black Phosphate, Black Oxide