Internal Hex, External Hex, Internal Torx, Hex, TX
Metric, AF, Torx, Imperial, SAE
5.5 mm, 10 mm, 9 mm, 11 mm, 1-1/2 "
38.1, 25.4, 6.35, 19.05, 12.5
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide