Finding a place to put fishing accessories is a problem. A solution to this problem is our Bert's Universal Rail Mount Clamp. When we say universal we mean universal. Fits round bow rail, round post & square pontoon boat rail. It fist the standard bow rail that is 7/8" diameter and all diameter posts and rails up to 1 1/4" square pontoon boat rail. Even the pontoon boat rail the skirt flange. It's heavy-duty clamp system with special tempered aluminum extrusions that are anodized. Hex bolts and nylock nuts that allow the clamp to secure to the rail by wrench tightening so they'll stay in place.