Curt Manufacturing 45901 Towing Wiring Fits trailer hitches with a 2" x 2" receiver tube opening Adjustable channel mount allows for precise trailer leveling Equipped with a 1" hole to accept a trailer ball shank Shank can be flipped for a max rise of 5 1/4" and drop of 6 3/4" Two hitch pin holes provide shank lengths of 11" or 12"