Check the listing for details. RAM-101-218-1U RAM Universal Double Ball Mount with Round Pl.... Color: Black, Condition: New. Listed at 69.44 USD. RAM Universal Double Ball Mount with Round Pl... RAM-101-218-1U Genuine RAM Products! The RAM-101-218-1U consists of a double socket arm mount with one round base and one base with 1/2 INCHES NPT hole for pipe or pedestal. The mount is approximately 7.50 INCHES tall at maximum extension and is collapsible. This measurement does not include length of pedestal used.product dimensions Overall Height: 7.5 INCHES socket to socket length 4.66 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 C Size (1.5 INCHES )weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbsmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.72 lb product dimensions Overall Height: 7.5 INCHES socket to socket length 4.66 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 C Size (1.5 INCHES ) weight capacity Standard Use: 4 lbsHeavy-Duty Use: 3 lbs materials Marine-grade aluminum packaging type Poly Bag Weight 0.72 lb