External Hex, Internal Hex, Internal Torx, Hex, TX
Metric, AF, Imperial, Torx, SAE
5/16 ", 9/16 ", 11 mm, 5/8 ", 34 mm
9.53, 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