Internal Hex, External Hex, Hex, TX, External Torx
Imperial, Metric, Torx, AF, SAE
6 mm, 9/32 ", 15 mm, 11/16 ", 9 mm
38.1, 19.05, 25.4, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide