Check the listing for details. RAM-138U-B RAM Double Ball Mount with Diamond Plate Adap.... Color: Black, Condition: New. Listed at 62.44 USD. RAM Double Ball Mount with Diamond Plate Adap... RAM-138U-B Genuine RAM Products! The RAM-138U-B 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 1.5 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: 5.225 INCHES socket to socket length 2.5 INCHES hole pattern 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 3-Hole 120-Degree: 1.812 INCHES Diameter2-Hole AMPS 1.912 INCHES ball size C Size (1.5 INCHES )weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbsmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.9 lb product dimensions Overall Height: 5.225 INCHES socket to socket length 2.5 INCHES hole pattern 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 3-Hole 120-Degree: 1.812 INCHES Diameter2-Hole AMPS 1.912 INCHES ball size C Size (1.5 INCHES ) weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbs materials Marine-grade aluminum packaging type Poly Bag Weight 0.9 lb