Brass duplex cover plate, for OmniBox® and Modulink Series floor boxes. Cover plate is 3.156 inch x 4.182 inch (80.2mm x 106.2mm). Flip lids can also be used with 106 type frames for communications. NOTE: Brass covers and flanges are not interchangeable with aluminum or nonmetallic covers and flanges. Nonmetallic covers are interchangeable with aluminum flanges.