Apollo propellers are highly polished, ultimate performance, stainless steel wheels. Apollo propellers are designed to use Michigan Wheel’s industry-preferred XHS Hub System, and are interchangeable with Mercury’s Flo- Torq II ™ system. Standard 3-Blade Recommended Boat Applications: Inflatables, Aluminum Consoles, Bass Boats, Flats Boats, Sport Boat Singles, Sport Boat Duals. Apollo Large Diameter propellers are great for heavier applications that require the increased blade area. Common to the entire Apollo line, the Apollo Large Diameter 3-Blade features CAD designed high-performance blade geometry. Large Diameter 3-Blade Recommended Boat Applications: Bay Boats, Offshore Singles, Offshore Duals, Sport Boat Singles, Sport Boat Duals, Pontoons, Family Cruisers, Workboats, Houseboats. The Apollo 4-blade propeller is designed to improve hole shot on heavier loads. This propeller is idea for pulling/towing in water sports. High performance blade geometry, high luster finish, and utilization of our XHS Hub Kit makes the Apollo 4-Blade the perfect propeller for a wide range of boats. Standard 4-Blade Recommended Boat Applications: Aluminum Consoles, Bay Boats, Walleye Boats, Offshore Singles, Offshore Duals, Sportboat Singles, Sportboat Duals, Skiboats.