Builders Edge 130130003001 Mount, 3 X 4-3/4 in Inner, 5 X 6-3/4 in Outer Dimension, White The Builders Edge Wrap Around Utility Block fits around existing pipes, wires, etc. Mounting blocks are durable, maintenance-free, UV stabilized and constructed with color molded-through so they won't scratch, flake, or fade Our patented Snap-On Trim Ring makes installation easy