CURT 60751 Double Lock Gooseneck Hitch with Flip and Store Ball, 30,000 lbs., 2 5 16 Inch Ball, Fits Select Toyota Tundra pins This particular class 3 ball harness This particular class 3 ball mount can be used in the drop position to provide a drop of 6" Features two welded trailer balls on a hollow shank Allows for quick switching between trailer ball sizes and drop or rise Mounts on trailer hitches with a 2" x 2" receiver tube opening Fits 1 7 8" or 2" couplers 2" rise or 4" drop for precise trailer leveling Permanently attached trailer balls cannot be loosened or stolen Hollow shank weighs less and can be used with an anti rattle kit Protected by a durable powder coat finish Limited lifetime warranty (one year finish giving you twice the security when towing especially heavy trailers using the included brackets