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Vortex Propeller Series B - 12 3/4" R21 - 3 Blade Aluminum Propfor 4-1/4" Gearcase Michigan Wheel Corporation has one goal - to produce the finest propellers possible, while maintaining the highest standards of quality. Since its founding in Michigan Wheel has dedicated itself to upholding that mission while offering boaters tremendous value.With almost years of experience as the marine propulsion industry leader, Michigan Wheel continues to make the custom-crafted propeller you buy off the shelf. The unmatched performance and the wide variety of styles and types in Michigan propellers offer boaters a single source for propellers that are custom made for every kind of pleasure craft in the water. Whatever your particular demands, Michigan Wheel can fit you with the right, hand-crafted propeller.Why Simply Replace When You Can Upgrade?Welcome to the 21st Century, and with it, Michigan Wheel's new Vortex Propellers and the XHS Exchangeable Hub System. These High performance aluminum replacement props feature high gloss, black, powder coat finish. Precision balanced blades significantly reduce vibration while the propeller's cupped trailing edge extends past the blade to better grab and hold water, dramatically enhancing performance and efficiency. Vortex carefully engineered each propeller blade to be thin enough to maximize performance while providing long lasting durability. And the high performance blade geometry found in these props feature a higher rake and a progressive pitch design to deliver a better combination of top end speed and dead start acceleration. Using a flared hub design Vortex propellers keep exhaust from causing speed robbing ventilation blow-out.Exchangeable Hub System EHSVortex propellers are designed to use Michigan Wheel's XHS hub system or Mercury's Flo-Torq 2 hub system. Meaning, you can purchase multiple pitch/diameter combination propellers to work with a single hub for significant savings. Plus, if you had a Mercury Flo-Torq 2 hub system supplied as original equipment with your boat, the compatible Vortex propellers will save you both time and money when you have to replace your propeller or upgrade your performance.Interchangeable with the Mercury Flo-Torq II exchangeable hub system, the Vortex and XHS propeller system is sure to fit most engine applications. Backed by Michigan Wheel's limited lifetime warranty, you can't lose with Vortex!. FREE Shipping Over $100, No Sales Tax