This self-locking ballmount is constructed of aircraft grade aluminum and stainless steel components. It carries a heavy-duty gross trailer weight capacity of 10,000 lbs. and a tongue weight of 1,000 lbs. Featuring a 3" rise or 4" drop, it uses a ball with a 1-1/4" shank diameter.
This cut-away view of the shank shows the locking mechanism in motion. As you turn the key, the locking pins will extend out through the pin holes to secure the ballmount in the trailer hitch.
DT-LBM9400 Fastway Diversi-Tech Self-Locking Fixed Aluminum Hitch