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-lb. maximum towing weight; 300-lb. maximum vertical load. Ball Diameter Hole (in.): 3/4, Shank Length (in.): 8, Gross Vehicle Weight Rated (lbs.): 3,500, Weight Capacity (lbs.): 300 8in. long 4in. maximum drop