Round ball base keeps the ball from sticking. Cam style latch stays where you put it. Flip-Over Ball For your Gooseneck Hitch Recommended my “MrTruck”In the seventies, I wrote articles about needing the gooseneck ball 5 inches in front of the rear axle for proper steering weight so your truck didn’t wander. Now with crew cabs and extended cabs, the truck frames are longer and 2 inches in front of the rear axle works. This helps with short beds. Popup places the ball 2 inches in front of the rear axles. The other guys are 5. Popup Flip-Over Ball also has a round shank, so it can rotate without a trailer and stay freed up. The other guys have a square shank and can stick or freeze up if not lubricated regularly. Free shipping.