This 20" enclosure universal On-Q bay-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. It includes a screw-on cover.FEATURES AND BENEFITS:• RoHS Compliant• Flanged covers hide drywall openings• Drywall depth indicators• Flush and surface installation• Mounting tabs provide correct flush-mount position for standard installations• Patented mounting system offers versatile module mounting options• Literature pouch included for dealer information• Includes self-adhesive cable identification table• Cover included• Made in the USA