RAM Base & Ball w/Garmin Mounting HardwareThe RAM-B-202-G2U marine grade aluminum base consists of a 1" diameter rubber ball connected to a flat 2.5" diameter base. This mount has a three hole pattern which will connect to the base of the Garmin Marine GPS unit swivel mounts. This base is designed to connect to the following devices: Garmin Fishfinder 120 Garmin Fishfinder 140 Garmin Fishfinder 160C Garmin Fishfinder 250/250C Garmin Fishfinder 320C Garmin Fishfinder 340C Garmin Fishfinder 400C Garmin Fishfinder 80 Garmin Fishfinder 90 Garmin GPSMAP 172 Marine GPS Garmin GPSMAP 172C Marine GPS Garmin GPSMAP 176 GPS Garmin GPSMAP 176C GPS Garmin GPSMAP 178C Marine GPS Garmin GPSMAP 276C GPS Garmin GPSMAP 292 Marine GPS Garmin GPSMAP 298 Marine GPS Garmin GPSMAP 376C GPS Garmin GPSMAP 378 Marine GPS Garmin GPSMAP 392 Marine GPS Garmin GPSMAP 398 Marine GPS Garmin GPSMAP 420 Marine GPS Garmin GPSMAP 430 Marine GPS Garmin GPSMAP 440 Marine GPS Garmin GPSMAP 450 Marine GPS Garmin GPSMAP 478 Marine GPS Garmin GPSMAP 492 Marine GPS Garmin GPSMAP 498 Marine GPS Garmin GPSMAP 520 Marine GPS Garmin GPSMAP 525 Marine GPS Garmin GPSMAP 530 Marine GPS Garmin GPSMAP 535 Marine GPS Garmin GPSMAP 540 Marine GPS Garmin GPSMAP 545 Marine GPS Garmin GPSMAP 550 Marine GPS Garmin GPSMAP 555 Marine GPS 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. Hardware included with purchase. Product : RAM MOUNT BASE W/ GARMIN SWIVEL MOUNTING HARDWARE 1" Manufacturer : RAM MOUNT Manufacturer Part No : RAM-B-202-G2U UPC : 793442001031