Curt 45900 Trailer Hitch Mounts on trailer hitches with a 2" x 2" receiver tube opening Adjustable channel mount allows for precise trailer leveling.Ball Diameter 2 or 2.3125 Fits 2" and 2 5/16" couplers and accepts up to 14,000 lbs. (depending on ball) Shank can be flipped for a max rise of 5 1/4" and drop of 6" Two hitch pin holes provide shank lengths of 11" or 12"