Check the listing for details. RAM-B-180U RAM Double Ball Mount with 9mm Angled Bolt He.... Color: Black, Condition: New. Listed at 47.94 USD. RAM Double Ball Mount with 9mm Angled Bolt He... RAM-B-180U Genuine RAM Products! The RAM-B-180U consists of a 1 INCHES diameter ball base with 9mm hole, double socket arm and diamond base adapter. This mount is often used on motorcycles, attaching to the mirror frame, most commonly found on BMW motorcycles. The 2.43 INCHES x 1.31 INCHES diamond base contains two holes 1.912 INCHES from center to center, matches the industry standard AMPS hole pattern and will connect to a large variety of RAM Mount and third party cradles. The mount is designed with a RAM 1 INCHES diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles.socket to socket length 3 INCHES hole pattern 2-Hole AMPS: 1.912 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.45 lb socket to socket length 3 INCHES hole pattern 2-Hole AMPS: 1.912 INCHES ball size B Size (1 INCHES ) weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lb materials Marine-grade aluminum packaging type Poly Bag Weight 0.45 lb