This is a single axle black plastic trailer fender that fits trailers with 14-inch diameter wheels, made of high-density injection-molded polypropylene for strength and stability. The fender measures 42.75 inches long by 9.75 inches wide, with a height of 13 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 through the pre-drilled mounting holes underneath each side step. This fender's mounting brackets measure 30" inside of bracket to inside of bracket, and 38.25" outside of bracket to outside. This is a common fender on single axle boat trailers, and is seen used on jet ski and boat trailers. The fender has a weight capacity of 300 pounds, and has mounting slots spaced 3.75 inches apart center to center, with slots spaced 30.25 inches apart