The Adjustable X-Mount Trailer Hitch Ball Mount is a receiver hitch accessory that allows you to use it in the drop or rise position. The ball mount includes a patent pending hitch u-pin with a dual clip design. The unique, patented X-Mount shank design allows less surface contact and channels away moisture to minimize rust build-up and seizing within the aperture of the receiver hitch. This X-Mount ball mount features increased towing capacity for today's towing demands, depending on your requirement. It is ideal for every day towing, but allows for maximum flexibility when towing multiple trailers and heavy cargo. Class IV mounts are great for towing very large campers, large boats and yachts, and trailers carrying commercial construction equipment. While these are common uses for this class, it is important that you know the total weight of your trailer and its contents, and that you do not exceed the recommended maximum towing capacity determined by your vehicle manufacturer.