The RAM-ROD Flush Base for Spline Posts has a socket for the RAM-ROD 2000 arm at 90 degrees to the base plate. It mounts flush on any kayak and uses a standardized hole pattern to avoid the need to drill additional holes in your boat. Compatible with RAM post and spline rod holders and RAM wedge mount ball adapters. These are great for adding mounting locations all over your vessel without having to buy complete mounts.