Install almost anywhere. Generous cavity under the flange for caulking, allowing installation without fasteners. Molded-in stand-offs on bottom to help prevent condensation build-up and keep containers from ticking to the bottom Four generous holes on bottom for drainage. I.D.: 2-11/16", width of flange: 3-1/2", cup depth: 2-7/8", hole cut: 3". White.
