RAM Mount 6.25" x 2" Rectangle Base w/1" BallRAM 6. 25" X 2" Rectangle Base with 1" Ball The RAM B 111BU consists 1" diameter rubber ball connected to a flat 6. 25" x 2" rectangle base. The base contains different combinations of pre drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and more. The RAM B 111BU is compatible with the following electronic devices: Garmin GPSMAP 162 Garmin GPSMAP 168 Garmin GPSMAP 175