Onyx 253344 Fixed Frame Projection Screen has 4" wide beveled, extruded aluminum frame interconnects on site with one simple hand tool that Draper provides. Each side piece slip fits tightly to injection molded plastic corners, forming perfectly mitered edges. A radical new approach to fabric attachment will amaze even the toughest of critics. There are no snaps! Uniform tension is applied to the entire surface area, so the surface is perfectly flat.