The RAM-D-111U-C consists of a SHORT double socket arm, 3.68″ diameter round base and 11″ x 3″ rectangular base. The round base contains pre-drilled holes, including two holes at 180 degrees and three holes at 120 degrees. The rectangle 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.