A rod holder system for use with a boat, specifically for use with a ski bar or other rail element on a boat. The rail can be round or square. The device could even be clamped to a rail of a wooden deck rather than on a boat. A stem is clamped to the rail using a clamp and several clamp screws. A rod holder with a sizing insert is screwed to a top end of the stem using a rod screw for connecting the holder to the stem. The sizing insert can be inserted into the holder and may be interchangeable depending on the rod to be placed within the holder, from a flag pole to a fishing pole handle to a spotlight pole.
