This is a pair single axle black plastic trailer fenders that is most commonly used with 12-14 inch tire and wheel assemblies. Made of high-density injection-molded polypropylene for strength and stability, this fender measures 37.25 inches long by 9.25 inches wide, with a height of 12 inches. The fender is impact-resistant and totally resistant to corrosion, making it perfect for freshwater and saltwater boat trailers. The fender easily bolts right onto your trailer using the slotted holes on the inside of the fender steps. This fender's mounting brackets measure 28.25" inside of bracket to inside of bracket, and 36.75" outside of bracket to outside. This fender is used on many Jet-Ski and Boat Trailers manufactured by top Trailer Builders like Shoreland'r, Continental, Triton, Yacht Club Trailers, and others!