DESIGN: Most popular choice of value priced positive-locking open-style rod holder models Holds almost any rod and reel set-up Secure hold with front-locking ring for prevention of rod loss when traveling Tough fibre-reinforced engineering grade nylon-manufactured materials of Power Lock provide strength against impact 360 deg all-around horizontal rotation allows positioning at any angle Full up-and-down adjustability Base mounts on top and side of gunnel Base: 4 in. x 2 in. x 2 in. Bolting: 1-5/16 in. x 3-3/16 in. Power lock interior diameter: 1.95 in. Style: 230Z