The Kawasaki ER6F Rear Axle Castle Nut is a specific replacement part designed for Kawasaki motorcycles from 2011 to 2013. Made by the manufacturer Kawasaki, this nut is essential for securing the rear axle of the motorcycle. This genuine part, with the manufacturer part number 42045-018, ensures a perfect fit and high quality for your Kawasaki ER6F bike, providing peace of mind for your ride.