Universal Class IV Ball Mount 6" Drop - Ball mounts function as a removable trailer ball platform that fits into the receiver hitch opening on a weight-carrying trailer hitch. This ball mount can be used in a rise or drop position to match the ball height to the trailer coupler. This Acme ball mount has the following features: Class IV Rating: 750 lbs., shank length: 8-1/2- inches, 6-inch drop, 4-1/4 inch rise, 1-1/4-inch ball hole and fits in 2-inch hitch receiver opening.