CURT 45927 Adjustable Trailer Hitch Ball Mount for 2 1 2 Inch Receiver, 10 3 8 Inch Drop, 2 and 2 5 16 Inch Hitch Balls, 20,000 lbs. Capacity distributing one advantage of a permanently Hub Face Length (Inches):89 one advantage of a permanently attached trailer ball is that it can never be loosened or stolen from your vehicle Aluminum is also lightweight for easier handling and installation of the crossbars whenever needed you know how much time and money are spent tailoring your towing system to each and every individual trailer Mounts on trailer hitches with a 2 1 2" x 2 1 2" receiver tube opening Adjustable channel mount allows for precise trailer leveling Shank can be flipped for a max rise of 8 7 8" and drop of 10 3 8" 2" ball rated for 10