A 400mm aluminum circle refers to a big round aluminum disc  with a diameter of 400mm. There’s no limit to its thickness, alloy and temper here, thus it covers a wide range of specifications like below. Grade: 1050 1060 1070 1100 3003 5052 5005 Temper: O, H12, H14, H16, H18, H22, H24, H26, H32 etc. Thickness: 0.1mm-10mm Diameter: 400mm Application: …