Curt Manufacturing CURT 45405 Trailer Hitch Adapter (Fits 2-1/2" Receiver, Accepts 2" Ball Mount Shank) Reduces a 2-1/2" x 2-1/2" receiver tube opening to fit a 2" x 2" shank High-strength carbon steel construction Protected by a highly durable carbide powder coat finish 5-1/2" length