RAM 1, 5"" Diameter Ball Mount with Short Double Socket Arm & 2/2, 5"" Round Bases w/AMPs Hole PatternThe RAM-101U-B consists of a short double socket arm and two 2, 5"" diameter round bases with the universal AMPS hole pattern, Designed into the mount is a 1, 5"" diameter patented rubber ball and socket system with adjustment points at both socket ends of the arm, Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles, High quality materials insure your device is safe, secure, and within easy reach, RAM"s patented design also dampens shock and vibration helping to extend the life of your device, Material: Powder Coated Marine Grade Aluminum Ball Size:1, 5"" Rubber Ball SizeNote: The ""U"" in the part number reflects product packaged in poly bag, , Product : RAM MOUNT 1, 5"" BALL MOUNT SHORT ARM W/ 2/2, 5"" ROUND BASE, Manufacturer : RAM MOUNT, Manufacturer Part No : RAM-101U-B, UPC : 793442010125 SKU: CW48149