Internal Hex, External Hex, Internal Torx, Hex, TX
Imperial, AF, Metric, Torx, SAE
5/8 ", 8 mm, 11 mm, 1-1/2 ", 11/16 "
38.1, 25.4, 19.05, 6.35, 9.53
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Gun-metal, Phosphated, Oxidised, Black Phosphate, Black Oxide