The Accessories Unlimited AUBALL CB Antenna ball mount provides ultimate adjustment and versatility in a permanent antenna mount. A CB antenna ball mount is a versatile mount that attaches to any flat surface and allows you to rotate the ball so that your antenna is vertical, no matter the angle of the mounting surface. You will need access to the opposite site of the mounting surface to tighten the mounting bolts and attach your CB coax. The AUBALL is designed to support antennas up to 4 feet tall. If you are looking for a durable, heavy duty antenna mount, the AUBALL, from Accessories Unlimited, is the one you need! MODEL NO - AUBALL