This is a Single Axle Galvanized Boat Trailer Fender. This fender is 16 Gauge Galvanized Steel. Galvanized Coated fenders are excellent for use in the marine environment. Having a Galvanized Coating on your fender will significantly reduce corrosion and rust caused by saltwater. This 16 Gauge Galvanized Boat Trailer Fender is also very sturdy, ideal for protecting your boat from road debris.This Particular Trailer Fender measures 9 inches wide x 31 1/2 inches long x 16 1/4 inches high, most commonly used with 13 to 14 inch trailer tires on boat trailers.