The RAM Suction Mount Arm and Square Base Plate has a standard 1" ball and socket which allows for almost infinite adjustment and perfect viewing angles. High quality materials ensure your electronic device is safe, secure, and within easy reach. RAM's patented design also dampens shock and vibration helping to extend the life of your mobile device.Standard length 1" ball arm, Twist suction mount and AMPS pattern base plate. When attaching the suction base, it must be clean and dry and so must be the surface it affixes to. An alternative method is to attach an adhesive rose pad the RAP-350 on to the dash area and fix the suction base onto it.