The RAM-B-272U consists of a 1" diameter ball and base with 9mm hole. This part is often used on motorcycles, attaching to the mirror frame, the main brand of bike for the RAM-B-272U is BMW.
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. Manufacturer : RAM Mounting Systems Manufacturer Part No : RAM-B-272U UPC : 793442102721