Check the listing for details. RAM-202-24-B-202U RAM Drill-Down Double Ball Mount for Humminbi.... Color: Black, Condition: New. Listed at 72.94 USD. RAM Drill-Down Double Ball Mount for Humminbi... RAM-202-24-B-202U Genuine RAM Products! The RAM-202-24-B-202U, powder coated marine grade aluminum mount, consists of a short double socket arm mount, one round 2.5 INCHES diameter round base with the universal AMPS hole pattern and one 2 INCHES x 4 INCHES rectangular base. The unique rubber ball and socket technology dampens shock and vibration while offering high adjustability to achieve the perfect viewing angle.product dimensions Overall Height: 5.225 INCHES socket to socket length 2.5 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 plate size Top Plate: 2 INCHES x 4 INCHES Bottom Plate: 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 1.1 lb product dimensions Overall Height: 5.225 INCHES socket to socket length 2.5 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 plate size Top Plate: 2 INCHES x 4 INCHES Bottom Plate: 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 1.1 lb