Screw-on cover is perfect for all installations, These new enclosures come with a screw, locking door and features universal On-Q style mounting holes that are compatible with all bay-style modules. It also includes larger top openings that make pulling wire easier as well as additional knockouts, more side lances and side tabs for more flexible mounting. This 14 inch enclosure is the perfect solution for a basic structured wiring system. It features larger top openings that make pulling wire easier as well as additional knockouts, more side lances, and side tabs for more flexible mounting. It does not includes a screw-on cover.