Durable flanged rear wheel axle nut designed specifically for GY6 125cc, and 150cc engines resistance to wear, corrosion, and heat, maintaining safety and stability for your vehicle Compatible with 139QMB, 152QMI, and 157QMJ engines, making it an essential replacement part for scooters, mopeds, ATVs, go-karts, and engine-powered vehicles Precision-engineered for a perfect fit, this axle nut provides optimal clamping force, preventing wheel slippage during high-speed riding or rugged terrain Easy installation on a variety of engine-powered vehiclesassembly quick and hassle-free making your maintenance routine simpler and more efficient Boost the performance of your 139QMB, 152QMI, and 157QMJ engines Enhance your riding experience