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 Motorcycle Base with 9mm hole and 1' Ball is BMW.
RAM Motorcycle Base with 9mm Hole and 1" Ball
Powder Coated Marine Grade Aluminum
1" Rubber Ball "B" Size
The "U" in the part number reflects product packaged in poly bag.