Enclosure Box 12" x 12" x 4", Indoor/Outdoor Non-Metallic, NEMA 3R Rated with Backplate - GreyThis enclosure box is made of heavy duty, UV rated non metallic material and has 1 2" and 3 4" knockouts on either side. It can be used indoors or outdoors to protect and secure power backups, security devices and other valuable equipment. When mounted in a vertical position, it meets NEMA 3R outdoor requirements. The back plate allows an installer to mount components to the plate even after the enclosure box is mounted. Physical Characteristics Color