Our new propeller nut and lock washer kit is designed to fit Alpha, pre-Alpha, Bravo 1, Mercury, and Mariner engines 75 -125HP. By securely fastening your propeller, this kit prevents loosening, thus extending the lifespan of both your propeller and shaft. The reduction of damage caused by vibrations associated with loose components leads to lower maintenance and repair costs over time. With its easy installation process, you can quickly and confidently ensure the safety and efficiency of your propulsion system.