Davis Instruments Troller Large Trolling Plate f/IO's + All Outboards 50hp & Larger Happy. For the Fisherman who thinks he has everything Slows even big motors down to that "ever-so-slow" fish tantalizing speed. A significant invention in the sport of troll fishing Happy Troller mounts on the anti-cavitation plate to allow fine control of trolling speed. At cruising speed your boat's stability is enhanced. Locks in "down" position for trolling. Locks in "up" position for cruising. Happy Troller is the answer to correct trolling speed. Use it year-round in all boating activities; salt and fresh water. Key Specifications for Davis Instruments Happy Troller Large Trolling Plate f/IO's + All Outboards 50hp & Larger: Manufacturer: Davis Instruments Color: Black Features of Davis Instruments Happy Troller Large Trolling Plate f/IO's + All Outboards 50hp & Larger Reduces troll speed in "down" position Acts as a stabilizer in "up" position Maintains stability in bow-light boats Smooths out ride in rough water Reduces porpoising and cavitation Made of only highest quality stainless steel and marine aluminum; clear anodized aluminum finish Installs in 15 minutes Stainless steel mounting hardware and installation & operating instructions provided with each unit Package Contents: Davis Instruments Happy Troller Large Trolling Plate f/IO's + All Outboards 50hp & Larger Davis Instruments 460: Troller Large Trolling Plate f/IO's + All Outboards 50hp & Larger Happy