Check the listing for details. RAM-B-101U RAM Universal Double Ball Mount with Two Roun.... Color: Black, Condition: New. Listed at 44.44 USD. RAM Universal Double Ball Mount with Two Roun... RAM-B-101U Genuine RAM Products! The RAM-B-101U consists of a medium length B size 1 INCHES double socket arm and two 2.5 INCHES diameter round ball bases that contain the universal AMPS hole pattern. The ball and socket system provides shock and vibration damping, and allows for near-infinite adjustability to achieve an ideal viewing and operating angle of your device.product dimensions Overall Height: 5 INCHES socket to socket length 3 INCHES hole pattern 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 3-Hole 120-Degree: 1.812 INCHES Diameterplate size 2.5 INCHES Diameterball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.51 lb product dimensions Overall Height: 5 INCHES socket to socket length 3 INCHES hole pattern 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 3-Hole 120-Degree: 1.812 INCHES Diameter plate size 2.5 INCHES Diameter 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 0.51 lb