The StingRay XRIII Hydrofoil Stabilizers are designed with a sleek, hydrodynamic profile that mirrors the tunnel-prop technology of offshore superboats. The stabilizers provide a fast hole shot and improve the boat's performance and fuel economy. By capturing prop wash, the stabilizers give the boat added thrust. The vice-block, 3-point locking system avoids damaging the engine and requires no drills, measurements or templates for installation. Compatible with engines up to 300 HP.