This clevis ball mount is ideal for a lunette ring trailer coupler. It is designed to fit 2-1/2" receivers. Clevis opening measures 2-1/2" with a 2-3/4" throat measured from the center of the 1-1/4" ball hole. This set up is rated to 10,000 lbs. of towing capacity and weighs in at an astonishing 30 lbs. Solid 2-1/2" shank makes it perfect for heavy duty use.