The Driftmaster 204BR Pro Round Aluminum Rail Clamp is ideal for those who do not want to drill holes in their railings. Screws on either side of the clamp allow for size adjustment. Aluminum construction makes the clamp lightweight and durable. Years of rigorous testing on the water and continuing refinement have made Driftmaster rod holders the standard of the industry. Driftmaster popularity is based on our reputation for excellence in quality, dependability, and service, with models available for all fishing situations.