The RAM ROD® Flush Spline Post Base (RAM-114FMU) installs directly into a vessel’s gunwale to create a clean, low-profile rod mounting location. Designed to fit into a 1.4"" diameter hole, the spline post base is secured by drilling down the four corners for a stable, permanent installation. The center socket is compatible with RAM ROD® and RAM® Tube™ rod holders featuring a spline post. An integrated rubber cap seals the socket when the rod holder is removed, helping prevent water from pooling and keeping your deck clean and dry.