Check the listing for details. RAM-B-101-A-24U RAM Double Ball Mount with Round Plate and 2".... Color: Black, Condition: New. Listed at 63.44 USD. RAM Double Ball Mount with Round Plate and 2"... RAM-B-101-A-24U Genuine RAM Products! The RAM-B-101-A-24U consists of a short lenght B-size arm with a 2.5 INCHES diameter round plate with universal AMPS hole pattern and a 2 INCHES x4 INCHES rectangular plate.product dimensions Overall Height: 3.75 INCHES socket to socket length 1.75 INCHES hole pattern Round Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES & 3-Hole 120-Degree 1.812 INCHES DiameterRectangular Plate: 1.5 INCHES x 3.5 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 1.0 lb product dimensions Overall Height: 3.75 INCHES socket to socket length 1.75 INCHES hole pattern Round Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES & 3-Hole 120-Degree 1.812 INCHES DiameterRectangular Plate: 1.5 INCHES x 3.5 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 1.0 lb