Now you can clamp rod holders on your tower, hardtop, T-top, radar arch, rails, or any structure made from standard size aluminum pipe instead of welding it. Made from marine-grade aluminum extrusions and cold-drawn tubing and anodized for 100% protection. 2" rod holder outside diameter. 6" mounting pipe circumference. 10"" Length Anodized Aluminum Rail Mounting | Lee's Tackle Clamp-On Fishing Rod Holder