Internal Hex, External Hex, TX, Hex, 6-Point
AF, Metric, Torx, Imperial, SAE
7/32 ", 9/16 ", 8 mm, 7/16 ", 3/16 "
38.1, 9.53, 19.05, 25.4, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide