The RAM-D-111U-E consists of a 3.68" diameter round base, LONG length double socket arm and 11" x 3" rectangular plate. The round base contains pre-drilled holes, including two holes at 180 degrees and three holes at 120 degrees. The rectangle plate 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. hardware included: (4) .312" x .187" Shoulder Washers product dimensions: Overall Height: 16.03" socket to socket length: 11.41" hole pattern: See Drawings plate size: Top Plate: 3" x 11"Bottom Plate: 3.68" Diameter ball size: D Size (2.25") weight capacity: Standard Use: 6 lbsHeavy-Duty Use: 5 lbs materials: Marine-grade aluminum packaging type: Poly Bag Weight: 5.75 lb Additional Information: The 11" x 3" rectangle base 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. Return Policy: All products purchased from RAM® can be returned within 30 days with no restocking fee (return shipping not provided).