The RAM Universal Adapt-A-Post with RAM Tube Jr. and 3.75" Spline Post combines both the revolutionary RAM Universal Adapt-A-Post Track Base and the RAM Tube Jr. with 3.75" spline post. The RAM Universal Adapt-A-Post is compatible across post and spline systems from RAM Mounts, Scotty, Fish-On, Railblaza, Cannon, Brocraft, Cabela´s and Bass Pro Shops. This version of the RAM Universal Adapt-A-Post Base is a track base compatible with RAM Tough-Track as well as most third-party track systems. Each RAM Universal Adapt-A-Post features a quick-release button to safely disengage the rod holder as well as keep it secure while fishing out on the water. The RAM Universal Adapt-A-Post Base also contains a locking lever used to prevent the base from spinning loose with any rod holder movement. Conversely, you can adjust the position of the base along the track by lifting the lever, loosening the base and reposition without loosening the rod holder. RAM Tube Jr. supports right and left handed handling.