1/4" edge taper white ceiling blank-up canopy used on raised rings, 3-1/2" and 4" octagon boxes. They are used to cover electrical wires or discontinued recessed can light openings in ceilings or walls. The tapered, 1/4” outside edge covers are perfect for hiding oversize box openings or drywall and plaster imperfections. Additionally, they have a universal mounting strap that spans all center distances.