ON Q SCREW-ON COVER: The Legran ScrewOn Cover with 12-inch enclosure is the perfect solution for a basic or entry-level structured wiring system. MATERIAL FOR SCREW-ON COVER: It has drywall depth indicators and the material is 20 Gauge CRS. AVAILABLE SIZES: It has different size for the different enclosure. The sizes are 14", 20", 28" or 42". STANDARD INSTALLATION: The ScrewOn cover has a flush and surface installation and its mounting tabs provide a correct flush-mount position for standard installations. VERSATILE MODULE: The ScrewOn cover patented mounting system offers versatile module mounting options (Left and Right module mounting), surface mounting and also it includes self-adhesive cable identification table, the Hinged cover is included and it is made in the USA.