Curt Manufacturing 45812 Towing Wiring Features an adjustable shank for maximum height flexibility Fits trailer hitches with a 2" x 2" receiver tube opening Adjusts in 1 1/2" increments for precise trailer leveling Shank can be flipped for a max rise of 6 1/4" and drop of 7 1/4" Equipped with a 1" hole to accept a trailer ball shank