The RAP-394-SSBMPU consists of the Tough-Tube™ fishing rod holder, 2" long ratchet spline post arm and combination/bulkhead/flat surface mounting base. The ratcheting feature allows for the tube to tilt forward and back 180 degrees for optimum viewing angles. The combination bulkhead/flat surface mounting base can be installed on a flat surface such as the deck or on a vertical surface. This mounting base features a locking feature which requires the release of a plunger to remove the rod holder. Ideally suited for anything from Kayaks to Tournament boats, this compact and simple design is ready for your next day on the water.