The RAM Quick-Grip with Flex Arm Twist-Lock Suction Mount consists of a 3.3" diameter suction base, a 6" flex arm and spring loaded cradle for supporting most phones. The suction cup base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. Rubber caps are included for additional support for the top and bottom fingers. Cradle Clamping Dimensions: Height Range: 4.75" - 5.75" Width Range: 1.25" - 3.25" Max Depth: 0.72"