The RAM-B-149Z-UN7U consists of a galvanized U-bolt base, a double socket arm, and a universal X-Grip holder. This package includes hardware that can accommodate rails with a diameter of 0.50" to 1.25". The base features black caps that fit over the exposed ends of the U-bolts. The holder is equipped with a patented 1" RAM rubber ball and socket system, which has adjustment points at both ends of the double socket arm, allowing for nearly infinite adjustment and perfect viewing angles. The included composite rail adapter can limit the rail to a minimum width of 0.5". The included X-Grip holder has a clean and clever four-leg design that provides a strong grip without hiding your phone behind foam pads and plastic. The spring-loaded X-Grip holder expands and contracts, allowing for a perfect fit for your phone. The RAM X-Grip is the perfect complement to the modern, sleek interiors of contemporary vehicles and is an evolution of the phone holder. The X-Grip includes a device cable recommended for outdoor applications. The holder is compatible with handheld devices that meet the dimensions listed below. It is important to check the dimensions of your handheld device with a case to determine the overall size.