Internal Hex, External Hex, Internal Torx, TX, Hex
Imperial, AF, Torx, SAE, Metric
9/16 ", 5.5 mm, 7 mm, 5/8 ", 11/16 "
9.53, 19.05, 25.4, 38.1, 6.35
Special Steel, Molybdenum Steel, Alloy Steel, Steel, Chrome Molybdenum Alloy Steel
Phosphated, Gun-metal, Oxidised, Black Phosphate, Black Oxide