The Shocker Combo Ball Mount attachment includes a 2″ and 2-5/16″ hitch ball with a 1/2″ to 3-1/2″ drop. The tow rating depends on the hitch ball installed. A 2″ ball would have a 10,000 lbs tow & 1,000 lbs tongue weight. A 2-5/16″ hitch ball would have a 16,000 lbs tow & 1,600 lbs tongue weight. It is designed to work with Shocker Air Receiver Hitches and Shocker Solid ball mounts.