The RAP-B-121-UN7U consists of a universal glare shield/clamp base, double socket arm and universal X-Grip cell phone cradle. Modular in design, switch out the clamps for a perfect fit no matter what the mounting surface. Crafted to hold firm to most glare shields, yokes, or tubing, practically any aircraft or vehicle can benefit from this product. The mounting base can also accept a second ball (RAP-B-121BBU) giving you the ultimate double ball base. The mount is designed with a RAM 2.54cm (1") diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. The included X-Grip cradle has a clean and clever four leg design that sports great holding power without hiding your phone behind foam pads and plastic. The spring loaded X-Grip cradle expands and contracts, allowing for a perfect custom fit of your cell phone. The perfect complement to the modern sleek interior of today's vehicles, the RAM X-Grip is the cell phone cradle evolved. The X-Grip includes a device tether recommended for outdoor applications. The cradle is compatible with handheld devices that will fit the dimensions listed below. It is important to verify the dimensions of your handheld device with a case/sleeve/skin when determining the overall size.