These concealed screen frame corners from Prime-Line are designed to fit into an aluminum lip-framed screen. They feature durable aluminum construction with a mill finish and with their 45-degree mitered cut design, they eliminate the need for miter cutting on your screen frames, making it faster and easier to make repairs or install replacements. This package includes 20 corners, providing enough to build multiple frames or make several repairs. 3/8 inch widthMade of aluminumMill finish