Fenestrelle Expanding Window Screens feature a strong, white anodized, aluminum box frame and polypropylene fabric screen (stronger than fiberglass) that will hold up to the harshest of conditions. Weather stripping top and bottom adjusts to rough surfaces and keep small critters from sneaking in. How to Use: Open Window Insert Fenestrelle Screen Expand to fit width of window Close window until it contacts top of screen.
