RAM Twist Lock Suction Cup Mount with Universal X-Grip Large Phone/Phablet CradleThe RAM B 166 UN10 consists of a 3. 3" diameter suction cup twist lock base, STANDARD length double socket arm and universal spring loaded X Grip cradle for 5" large phones and phablets. 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