The RAM-B-166-GA12 consists of a 3.25″ suction cup locking base, socket system and custom high strength composite cradle for the Garmin GPSMAP. 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 Astro 220 Garmin GPS 60 Garmin GPSMAP 60 Garmin GPSMAP 60C Garmin GPSMAP 60CS Garmin GPSMAP 60CSx Garmin GPSMAP 60CxMaterial: High Strength Composite and Powder Coated Marine Grade Aluminum Ball Size: 1″ Rubber Ball „B” Size Note: Part number reflects product packaged in clear clam shell for store shelf display. *The cradle for the RAM-B-166-GA12 requires the standard belt clip button which is included with the purchase of the GPS unit from Garmin. Related Links:RAM GPS Mounts PageRAM Suction Cup Mounts Page.