Nilight Trailer Hitch Ball Mount with 2-5/16Inch Trailer Ball & 5/8″ Hitch Pin Clip Fits 2-Inch Receiver 7500 lbs 2″ Drop,2 Years Warranty. This trailer hitch ball mount comes with a 2-5/16inch x 2-5/16 inch shank to fit virtually any industry-standard 2-inch receiver. The ball mount has a 2-inch drop, 2-5/16 inch diameter ball and 5/8-inch pin hole.