See Aluminum Tolerances
Aluminum Expanded Sheet 3003 Flattened offers good strength, high durability, easy machinability, high corrosion resistance, and light weight. It is a single piece construction that won't unravel and can be easily cut, formed, or welded. 3003 aluminum is well-suited to outdoor and harsh environment applications due to its durability and corrosion resistance. It is typically used in decorative parts, structural and vehicle trim, chemical tanks, pressure vessels, and piping.
Expanded Sheet is popular for filters, covers, artwork, and security grates.
Flattened means that the pieces of the mesh have a flattened top bottom surface.