Gets even the heaviest boats up on plane twice as fast with the industry's fastest hole shot and reduces bow rise. The unique design of the XRIII harnesses the prop-wash and creates a powerful, thrust-enhancing cone. Complete with full-surface graphic inlays, the XRIII is ideal for heavier boats needing greater lift, as well as boats pulling tubers, skiers, and wakeboarders! Chinewalking, cavitation, and porpoising are eliminated while boaters experience true stabilization, lift, and enhanced control of the boat. Plus, No-Drill installation is simple and quick! Does not fit Volva Penta Engines w/exhaust thru the anti-cavitation plate.All No-Drill StingRay Hydrofoils have the patented No-Drill Technology designed into the hydrofoil and DO NOT need any type of adapter or additional pieces.