Vortex propellers are high-performance aluminum propellers with an XHS Xchangeable Hub System. They offer a high gloss powder coating, high-performance blade geometry, and well-balanced blades. Vortex propellers are an excellent replacement or spare propeller option, and they are available for a wide range of applications (9.9 HP to V6/V8 Outboard & Sterndrive). The new 992502 Vortex 4-blade propellers are intended to improve holeshots while maintaining top-end speed. The new, aggressive blade geometry works in tandem with an extra cup to provide maximum acceleration and grip, while a smaller diameter assists in top-end speed retention. Key features: The geometry of high-performance blades The XHS/XHS II Xchangeable Hub System is used - a hub kit is offered separately. Inflatables, aluminum consoles, ski boats, offshore singles, walleye boats, pontoons, and family cruisers are all recommended applications. Specifications: Diameter: 10.5" x Pitch: 10" Rotation: Right Hand Engine type: Evinrude, Johnson, Honda, Mercury, Suzuki, Tohatsu, Yamaha (20-35HP) Number of splines: Determined by hub kit Hub kit: required Number of blades: 3 Manufacturer: Michigan Wheel Maring Brand: Michigan Wheel Marine