The Cannon Clamp Mount is perfect for mounting downriggers on small boats. Will only work with Easi-Troll™ or Mini-Mag™ downriggers, but will accept tab-lock base for mounting other models. Maximum clamp opening: 2". Base top: 4" x 4-1/4".
The cannon clamp mount is very strong and reliable. Mine survived many mishaps including breaking a downrigger arm. With a weaker mount, I could have lost the whole downrigger! One star off for the cost being a bit high.