Check the listing for details. RAM-B-111U-A RAM Universal Marine Electronic Mount - B Siz.... Color: Black, Condition: New. Listed at 49.44 USD. RAM Universal Marine Electronic Mount - B Siz... RAM-B-111U-A Genuine RAM Products! The RAM-B-111U-A consists of a short double socket arm, 2.5 INCHES diameter round base and 6.25 INCHES x 2 INCHES rectangle base. The round base contains pre-drilled holes, including the universal AMPS hole pattern. The rectangle base contains different combinations of pre-drilled holes which will match up to many electronic devices and mounts, including Marine GPS, CB Radios, Ham Radios, Gimbal Brackets and more.product dimensions Overall Height: 3.75 INCHES socket to socket length 1.75 INCHES hole pattern 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 3-Hole 120-Degree: 1.812 INCHES DiameterSee Drawingplate size Top Plate: 6.25 INCHES x 2.5 INCHES Bottom Plate: 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 0.67 lb Additional Information This plate is a universal mounting bracket with a selection of mounting hole locations. In certain applications additional holes may need to be drilled for proper fit with your electronic device. product dimensions Overall Height: 3.75 INCHES socket to socket length 1.75 INCHES hole pattern 4-Hole AMPS: 1.181 INCHES x 1.496 INCHES 3-Hole 120-Degree: 1.812 INCHES DiameterSee Drawing plate size Top Plate: 6.25 INCHES x 2.5 INCHES Bottom Plate: 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 0.67 lb