Check the listing for details. RAM-B-139-G4U RAM Drill-Down Double Ball Mount with Hardwar.... Color: Black, Condition: New. Listed at 47.44 USD. RAM Drill-Down Double Ball Mount with Hardwar... RAM-B-139-G4U Genuine RAM Products! Simply choose your preferred mounting location and the possibilities become endless with the Garmin GPSMAP Flat Surface Mount. Rubber ball and socket technology allows for almost infinite adjustment and perfect viewing angles. High quality materials insure your Garmin GPSMAP is safe, secure, and within easy reach. RAM's patented design also dampens shock and vibration helping to extend the life of your mobile device.hardware included (3) #8-32 x 5/8 INCHES Machine Screws(3) #8-32 Nylock Nutsproduct dimensions Overall Height: 5 INCHES socket to socket length 3 INCHES hole pattern Round Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES & 3-Hole 120-Degree: 1.812 INCHES DiameterRectangular Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES plate 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 0.55 lb hardware included (3) #8-32 x 5/8 INCHES Machine Screws(3) #8-32 Nylock Nuts product dimensions Overall Height: 5 INCHES socket to socket length 3 INCHES hole pattern Round Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES & 3-Hole 120-Degree: 1.812 INCHES DiameterRectangular Plate: 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 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 0.55 lb