Check the listing for details. RAM-B-138U-A RAM Double Ball Drill-Down Mount with Diamond.... Color: Black, Condition: New. Listed at 41.44 USD. RAM Double Ball Drill-Down Mount with Diamond... RAM-B-138U-A Genuine RAM Products! The RAM-B-138U-A consists of a 2.5 INCHES diameter round base that contains the universal AMPs hole pattern, SHORT double socket arm and diamond base adapter. The mount is designed with a 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. The hole pattern found on the diamond base adapter will connect to most RAM cradles. The included RAM's patented design dampens shock and vibration, helping to extend the life of your device.product dimensions Overall Height: 3.75 INCHES socket to socket length 1.75 INCHES hole pattern Diamond Plate: 2-Hole AMPS: 1.912 INCHES Round Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES & 3-Hole 120-Degree: 1.812 INCHES Diameterplate size Round Plate: 2.5 INCHES DiameterDiamond Plate: 2.43 INCHES x 1.31 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.4 lb product dimensions Overall Height: 3.75 INCHES socket to socket length 1.75 INCHES hole pattern Diamond Plate: 2-Hole AMPS: 1.912 INCHES Round Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES & 3-Hole 120-Degree: 1.812 INCHES Diameter plate size Round Plate: 2.5 INCHES DiameterDiamond Plate: 2.43 INCHES x 1.31 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 0.4 lb