Fender washers are flat, round metal washers with a larger outer diameter compared to standard washers. They are designed to distribute the load of a fastener over a larger area, which helps prevent damage to the material being fastened. This makes them particularly useful in applications where the material is soft or prone to deformation. These washers are commonly used in various construction and automotive projects, including securing fenders on vehicles. They come in different sizes and materials, such as stainless steel or galvanized steel, to suit different environments and applications.