Quantity of (6): Amerimax Products # 21348 Universal Fit Expanded Galvanized Aluminum Gutter / Downspout Strainers. The Amerimax Universal Aluminum Wire Strainer is designed to fit both square and round downspouts. Featuring durable aluminum construction, this wire strainer can be used to help prevent clogged downspouts and drainpipes. This wire strainer installs easily and does not require special tools for installation. Sturdy Metal Mesh Construction. Galvanized for Rust Resistance. Fits Most Downspouts.