The RAM-B-166-UN4 consists of a 3.3" diameter suction cup twist lock base, double socket arm and universal Finger Grip™ cradle. 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 universal Finger Grip™ cradle is designed to hold a large amount of cell phones and electronic devices. The cradle comes with (3 sets) of four flexible rubber coated fingers placed along sides to grip your device. The fingers open by squeezing the ends to open the small finger arms. The bottom of the cradle includes a back plate that adds support to the device being held by the mount.