The RAM-114FMTU consists of a round flush mounting base and a socket compatible with RAM ROD® and RAM-TUBE™ holders with a spline post. Designed to accommodate gunwales up to two inches thick, and seat with no visible hardware, this product is ideally suited to a wide variety of applications. This mounting base is ideal for kayaks and water craft with limited mounting space. Includes a rubber cap for sealing from water when not in use, the included nylon threaded cap seals the bottom.