RAM Universal Marine Electronic Mount (RAM-B-111U-A) (sku 54644)The RAM B 111U A consists of a short double socket arm, 2. 5" diameter round base and 6. 25" x 2" rectangle base. The round base contains pre drilled holes, including the universal AMPS hole pattern. 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. PRODUCT DIMENSIONS Overall Height: 3. 75" SOCKET TO