The RAM-B-166-UN7U consists of a 3.3″ diameter suction cup twist lock base, standard length double socket arm and universal spring loaded X-Grip® cradle for cell phones. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces. 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 compliment to the modern sleek interior of today’s vehicles, the RAM X-Grip® is the cell phone cradle evolved.