The RAP-394-SSFMTU consists of the Tough-Tube™ fishing rod holder, 2" long ratchet spline post arm and round flush mounting base. The ratcheting feature allows for the tube to tilt forward and back 180 degrees for optimum viewing angles. The round flush mounting base is 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. Once installed, the post spline can be removed and the hole capped making it water tight. Ideally suited for anything from Kayaks to Tournament boats, this compact and simply design is ready for your next day on the water.