The Sea-Dog Rail-Mount Rod Holder is designed with a front-mount screw which allows easy adjustments without having to disassemble the rail-mount brackets. It is a quick and easy way to add rod holders to pontoon boats. Injection-molded polyethylene construction remains durable in marine applications. Note: Sea-Dog recommends using a safety line on the rod and/or reel when used with rail-mount rod holders. Fits 1-1/4" x 1-1/4" tubing. 11-3/4"L. 1-3/4" diameter rod holder.