The 5/16" x 3/4" roll formed window screen frame is a commonly used size in the window screen industry and is considered to be an industry standard. The frame is made from a roll forming process, which involves shaping a flat sheet of aluminum or another metal material into a specific profile. The result is a lightweight and strong frame that can support the mesh of a window screen. The dimensions of 5/16" x 3/4" provide a balance between strength and flexibility, making it suitable for a variety of window types and sizes. This standard size is easy to find and readily available at many hardware stores and online retailers. The roll formed window screen frame is a popular choice among homeowners and contractors alike due to its durability, affordability, and ease of installation.