The RAM-D-111U-C consists of a short double socket arm, 93mm diameter round base and 279 x 76mm 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.