RAM Universal Double Ball Mount with Two Large Round Plates (RAM-D-101U-E) (sku 54138)The RAM D 101U consists of (2 qty) 3. 68" diameter round bases and LONG length double socket arm. The 3. 68" diameter round bases have pre drilled holes, including two holes at 180 degrees and three holes at 120 degrees. Designed into the mount is a 2. 25" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm. PRODUCT DIMENSIONS Overall Height: 15. 5" SOCKET TO SOCKET LENGTH 11. 41" BALL SOCKET SIZE D