Reduces gear shock and engine/drive damage. Minimizes propeller vibration and chatter. Corrosion resistant brass splines and nylon. Eliminates spun hubs. Ends hub cracking.Turning Point Propellers' Mission is to produce the best performing propeller by utilizing leading edge designs and manufacturing technologies. They are driven to help every boater become a prop expert and provide the tools to help you find the ideal propeller for your boat.Reduce gear shock & engine/drive damage.Outer hub compatible with different props.Compatible with Michigan Wheel XHS and Mercury Flo Torq hub kits, but greatly increases ease of installation, durability, and shock absorption value.