RAM MOUNTS' RAP-B-166-2-UN7 twist lock suction cup mount consists of a 2.75 in twist lock suction cup base, double socket system and universal spring-loaded X-Grip holder for cell phones. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. The mount is designed with a RAM 1 in 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 holder expands and contracts, allowing for a perfect custom fit for all different kinds of mobile devices. The perfect complement to the modern sleek interior of today's vehicles, the RAM X-Grip is the cell phone holder evolved.*Retail packaged. Holder dimensions: 0.875 in W x 3.25 in H x 0.875 in L.