A sway control unit is an inexpensive solution to the problem of a wandering trailer. CURT sway control units are designed to attach to your vehicle and trailer at the coupling point and counteract any lateral movement in your trailer, keeping your tow load straighter on the road and giving you more control over your vehicle. This sway control ball kit is designed to bolt onto the tongue of a trailer frame to provide a mounting place for the CURT sway control unit #17200. It features a welded trailer ball and a thick mounting plate and comes with four self-tapping screws to easily attach to the trailer frame. It also includes two attachment clips.