From B&W, this is an accessory to the Turnover Ball Gooseneck Hitch. A 4" gooseneck Extender. The Extender allows four more inches of turning clearance between the truck cab and the front of your trailer. This 4" Extender requires an existing Turnover Ball Gooseneck Hitch already installed in your truck. It simply drops into place where your 2 5/16" ball normally sits. (remember to release safety pin back into neck after installing). Made from 3/4" steel plate, 20,000 lb GTW, 5,000 lb VTW.