Buyers ball mount fits 1 1/4in. square receivers (Class I and II). Solid steel construction with corrosion-resistant black powder-coat finish. Accepts towing balls with 3/4in. dia. shank. 3500 lbs. maximum towing weight; 300 lbs. maximum vertical load. Ball Diameter Hole (in.): 3/4, Shank Length (in.): 9, Gross Vehicle Weight Rated (lbs.): 3,500, Weight Capacity (lbs.): 300 9in. long 1 1/2in. drop