The RAP-B-121-238U, universal glare shield/yoke mount, is ideally suited for a day on the wing and yet easily removed for travel in the flight bag. Both strong and lightweight, this new clamping base is perfect for numerous electronic devices commonly found in the cockpit. Modular in design, switch out the clamps for a perfect fit no matter what the mounting surface, or add a second ball to mount another device; brilliant. Crafted to hold firm to most glare shields, yokes, or tubing, practically any aircraft can benefit from this product. Simple to use and exceptionally versatile, RAM has created another "must have" for any pilot. Once you have had a chance to use this great little device, we are confident you'll find uses for it no matter what you fly, drive, or ride. With everything you get in this package, you may even find yourself using your new RAM Mount on a golf cart, work bench, or even exercise equipment. With RAM, there are no limits. The RAP-B-121-238U fits rails or edge lips from 1.59cm (0.625") to a maximum of 3.18cm (1.25") . The mounting base can also accept a second ball (RAP-B-121BBU) giving you the ultimate double ball base.