The Tie Down Drop-N-Go Auto Latch helps prevent incorrect latching or forgetting to properly close the latch mechanism which can cause trailer separation. Set the Drop-N-Go Auto Latch Coupler in the tow (latch) position, and it automatically latches when set on top of the hitch ball with just minimal pressure. Cast steel ball clamp and latch handle are incredibly strong. Class 4 coupler. 7,000-lb. capacity. Use with a 2" hitch ball. Fits on a 3" tongue or channel tube.