The RAM-B-166-UN10U consists of a 3.3" twist lock suction cup base, double socket arm and universal spring loaded X-Grip® IV holder for 5" large phones and tablets. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at both ends of the socket arm; this with a twist of the arm knob, allows you to move the mount to your optimum viewing position. The spring loaded X-Grip® IV holder expands and contracts, allowing for a perfect custom fit of your 5" phone or tablet. Included are easy access grip knobs for quick insertion and release of your handheld device.?