Optimize the performance of your motor when running at full tilt as well as when slowly trolling along a breakline with one easy-to-install unit. The hydrofoil eliminates bow rise, back spray and performance draining rooster tails and directs every ounce of power to where it is most useful. The stabilizing fin also reduces porpoising and enhances handling for more efficient turning and gas usage. When you arrive at your trolling location, put the boat in neutral, pull the cord and the trolling plate locks down with the use of heavy-duty springs. The plate redirects the thrust the propeller exerts, cutting your idle speed down for precise control of your crawler harness or crankbait without the need for a separate kicker motor. When you're ready to leave, just pull the cord again while at trolling speed and the force of the propeller swings the plate back up and locks it in the running position. And to protect your lower unit in case you forget to pull the trolling plate up, the locking mechanism is outfitted with a shear pin that breaks away and lets the force of the motor push the plate up for running. The Hydro Troll also comes with an extra shear pin that can be replaced when you're on the water, so one mishap doesn't have to ruin your entire fishing day. The entire assembly attaches to your engine's cavitation plate in minutes with minimal tools. It works on both outboard and I/O motors from 25hp to 150hp. Corrosion-resistant, stainless steel mounting hardware included. Extra shear pins also are available.