Check the listing for details. RAM-D-111U RAM Large Marine Electronics Mount - D Size M.... Color: Black, Condition: New. Listed at 166.49 USD. RAM Large Marine Electronics Mount - D Size M... RAM-D-111U Genuine RAM Products! The RAM-D-111U consists of a medium double socket arm, 3.68 INCHES diameter round base, and 11 INCHES x 3 INCHES rectangle base. The round base includes a 2.25 INCHES D size rubber ball and contains pre-drilled holes, including the universal AMPS hole pattern. The rectangle base also includes a 2.25 INCHES D size rubber ball and contains a variety of pre-drilled holes that are compatible with several large marine electronic devices, including fishfinders and chartplotters.hardware included (4) .312 INCHES x .187 INCHES Shoulder Washersproduct dimensions Overall Height: 11.5 INCHES socket to socket length 6.88 INCHES hole pattern See Drawingsplate size Top Plate: 3 INCHES x 11 INCHES Bottom Plate: 3.68 INCHES Diameterball size D Size (2.25 INCHES )weight capacity Standard Use: 6 lbsHeavy-Duty Use: 5 lbsmaterials Marine-grade aluminumpackaging type Poly BagWeight 4.47 lb Additional Information The 11 INCHES x 3 INCHES 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. hardware included (4) .312 INCHES x .187 INCHES Shoulder Washers product dimensions Overall Height: 11.5 INCHES socket to socket length 6.88 INCHES hole pattern See Drawings plate size Top Plate: 3 INCHES x 11 INCHES Bottom Plate: 3.68 INCHES Diameter ball size D Size (2.25 INCHES ) weight capacity Standard Use: 6 lbsHeavy-Duty Use: 5 lbs materials Marine-grade aluminum packaging type Poly Bag Weight 4.47 lb