Davis Happy Troller Small Trolling Plate f/Outboards 20-50hp Slows Even Big Motors Down To That "Ever-So-Slow" Fish Tantalizing Speed. At Cruising Speed, Your Boat'S Stability Is Enhanced. Locks In "Down" Position For Trolling. Locks In "Up" Position For Cruising. Box Dimensions: 21"Lx12"Wx4"H. Weight: 5 lbs.