RAM MOUNT BASE W/ 9MM HOLE AND 1`` BALL $24.99 SKU: KIMPEX:280295 Default Title - $24.99 Title Default Title Qty. Qty. Add to Cart 1" rubber ball 9mm hole This part is often used on motorcycles Attaches to the mirror frame, the main brand of bike for the RAM-B-272U is BMW Powder Coated Marine Grade Aluminum