RAM 11mm Flat Base with Double Socket Arm and Diamond Adaptor (U)The RAM-B-179U, offset motorcycle base, makes attaching to a variety of mounting locations, including handlebars, a breeze, Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles, High quality materials insure your mobile electronic device is safe, secure, and within easy reach, RAM"s patented design also dampens shock and vibration helping to extend the life of your mobile device, With a turn of a single comfortable to grasp knob, adjustments can be made and the sleek hourglass shape of the arm assembly compliments the lines of any motorcycle, The RAM-B-252U, base for the RAM-B-179U, consists of a 1"" diameter ball and 2, 25"" x 0, 875 base with 11mm hole, This part is often used on motorcycles, attaching to the mirror frame, the main brand of bike for the RAM-B-252U is BMW, This part fits well on many handlebar pinchbolts with a washer (base is 5mm thick), Material: Powder Coated Marine Grade Aluminum Ball Size: 1"" Rubber Ball ""B"" Size Note: The ""U"" in the part number reflects product packaged in poly bag, , Product : RAM MOUNT 11MM FLAT BASE W/ DOUBLE ARM AND DIAMOND ADAPTER, Manufacturer : RAM MOUNT, Manufacturer Part No : RAM-B-179U, UPC : 793442921841 SKU: CW47721