The Ultra-Tow A-frame trailer coupler fits standard A-frame jack mounting holes. Weld onto frame members set at 50° angles. E-coat plating resists rust and corrosion. Material: Steel, Foldable: No, Ball Diameter (in.): 2 5/16, Max. Gross Trailer Weight (lbs.): 14,000, Fits Ball Size (in.): 2 5/16.