VERVIEW M-D-115 consists of a base with a 2.25” diameter D size ball, a standard arm and a 6.25” x 2” marine electronic plate with a D size ball for supporting larger devices. This marine electronic plate contains different combinations of pre-drilled holes and is a direct fit for 9”-12” fishfinder gimbal brackets. Supports devices such as the Lowrance HDS-9 Gen2 Touch, Garmin GPSMAP 7407 and more. PRODUCT DIMENSIONS Overall Height: 10.7" SOCKET-TO-SOCKET LENGTH 6.88" PLATE SIZE Top Plate: 6.25" x 2"Bottom Plate: 3.68" Diameter BALL/SOCKET SIZE D Size (2.25") WEIGHT CAPACITY 6 lbs MATERIALS Marine-grade aluminum PACKAGING TYPE Retail Box WEIGHT 4.25 lbs. ADDITIONAL INFORMATION The 6.25" x 2" 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.