The XHS Exchangeable Hub System from Michigan Wheel relieves shock and tension produced by changing gears. The Michigan Wheel XHS Ballistic has a 13-1/8" diameter with a 21 pitch Right-Hand rotation and a three-blade stainless steel boat prop. It features strongly cambered blades for increased speed and bow lift. The interchangeable hub system is used (XHS). Suitable for the following boat applications: Sport Boat Singles, Sport Boat Duals, Ski Boats, Pontoons, Bass Boats, Bay Boats, Flats Boats. Key Features: Standard 3-Blade & XL Optimum blade strength and thickness Fits 4-3/4" Gearcase For Engine: V4 - 4-1/4" Gearcase XHS unit is removable Blade tip and cup combine Tapered leading edges Flared Hub Design that prevents ventilation blow out Urethane-cushioned hub, designed to spin under heavy impact Compatible with both the XHS and Flo-Torq II hub propeller systems Mirror Finish Stainless Steel Alloy Specifications: Brand: Michigan Wheel SKU: 933421 UPC: 014984020466 Weight: 11.00 LBS Pitch: 21 Material: Stainless Steel Hub Kit: Not Included Diameter: 13-1/8 inch Blade: 3 Standard 3-Blade & XLMUST use Gearcase Adapter Ring supplied with propeller