Made up of durable polypropylene plastic and designed for flush mounting, the cup holder has a stepped design that makes the cup holder great for holding standard-size containers as well as larger cups or cans with cozies. The newest version of the unique design. Ideal for boat, yacht, truck, car, RV, game table, sofa, apartment, caravan, dashboard, seat back, and any more. Easy to Install: The drain comes with a nut and bolt that can close and seal the drain. Dimensions: Height: 3-1/2 inch, Flange: 4-1/4 inch, Barb: 3/8 inch. Perfect for ROCKY MOUNTAIN 30 oz. Insulated Tumble. Package Includes Pack of 1 Marine City Newest White Closeable Drain Plastic Cup Holder.