Never buy another hub kit system again. Inner splines adapt to the engine. Outer hub compatible with different props. Reduce gear shock & engine/drive damage. Save up to 30% when purchasing a replacement prop. Eliminate propeller vibration & chatter. Eliminate hub cracking & failure. Corrosion resistant materials - brass splines. Reduce gear shock & engine/drive damage. Compatible with Michigan Wheel XHS and Mercury Flo Torq hub kits, but greatly increases ease of installation, durability, and shock absorption value. Also adapts to all Michigan Wheel and Mercury interchangeable propellers.