Boat Seat Clamp with Swivel lets you hook up your own chair in your Jon Boat. BIG BUCKS OFF!If the fish are taking all day to bite, show 'em you'll wait! Grab your favorite Boat chair and hook it up to this Clamp... it mounts on any flat surface in your Boat. It'll adjust from 8-16" so you can get the right fit for your boat. And the swivel feature lets you easily turn when you reel a feisty bass. Now you can sit back and enjoy those longer days fishing on the lake!