The RAM-B-166-GA19U consists of a 3.25″ suction cup locking base, socket system and custom high strength composite cradle for Garmin StreetPilot c300 series devices. 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. RAM’s patented design dampens shock and vibration helping to extend the life of your mobile device. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks.This mount is designed to hold the following devices: Garmin StreetPilot c310 Garmin StreetPilot c320 Garmin StreetPilot c330 Garmin StreetPilot c340 Material: High Strength Composite and 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. This mount does not include the power adaptor but will accept the Garmin factory power adaptor from the original mounting system. The cradle does not block the internal antenna or speaker and allows for use of the factory 12V power adaptor. Utilizing a 1″ rubber ball, this cradle seamlessly integrates into any of the RAM compatible mounts. Related Links:RAM GPS Mounts PageRAM Suction Cup Mounts Page.