The RAM-B-166-MA4U, twist lock suction cup mount consists of a 3.25″ suction cup locking base, socket system and connection hardware for the Magellan Maestro and RoadMate. The mount is designed with a RAM 1″ diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. Simply attach the suction cup base to the windshield of your vehicle for an easy and safe way to view your handheld device in your vehicle. 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. This mount is designed to hold the following devices: Magellan CrossoverGPS 2500T Magellan Maestro 4000 Magellan Maestro 4040 Magellan Maestro 4050 Magellan RoadMate 300 Magellan RoadMate 360 Magellan RoadMate 500 Magellan RoadMate 500 Plus Magellan RoadMate 2000 Magellan RoadMate 2200T Magellan RoadMate 3000T Magellan RoadMate 3050T Magellan RoadMate 6000T Magellan RoadMate 700 Magellan RoadMate 760 Magellan RoadMate 800 Magellan RoadMate 860T Material: Powder Coated Marine Grade Aluminum Ball Size: 1″ Rubber Ball „B” Size Note: The „U” in the part number reflects product packaged in poly bag.Related Links:RAM GPS Mounts PageRAM Suction Cup Mounts Page RAM® double socket arms with their distinctive hour-glass shape are designed and recognized to provide the best possible performance for most any application.