The Genuine Mercedes Fender Liner Nut - 0039948545 is a small, round nut that is specifically designed for use with Mercedes vehicles. It is used to secure the fender liner, which is a protective panel that covers the inside of the wheel well. This nut is made from high-quality materials and is an original equipment manufacturer (OEM) part, ensuring a perfect fit and reliable performance. It is an essential component for keeping the fender liner securely in place, protecting the wheel well from debris and providing a sleek, finished look to the vehicle. This fender liner nut is an important part of maintaining the overall appearance and functionality of a Mercedes vehicle.