"Ultra-Tow trailer coupler with Posi-Lock design enables fast trailer hookups, with a trigger action mechanism for quick locking to trailer ball. Fits Ball Size in. 1 7/8, Material Steel, Max. Gross Trailer Weight lbs. 2,000, Ball Diameter in. 1 7/8. Fits 3in. channel Class 1 light duty Zinc-plated steel resists rust and corrosion"