This is a replacement ball housing for the Andersen Weight Distribution Hitch. "IMPORTANT: If your WD Hitch has a black triangle plate, this part will NOT work with your existing system. Please send pictures of your hitch setup along with your contact information, address, and a brief description of your issue to customerservice@anderseninc.com.Ball Housing2 5/16" Ball (16k)Brake Material (Friction Cone)