The RAM-D-111U consists of 93mm diameter round base, Mediumium double socket arm and 279 x 76mm rectangular plate. The round base contains pre-drilled holes, Including two holes at 180 degrees and three holes at 120 degrees. The rectangle plate 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.