RAM Marine Electronics Ball AdapterThe RAM-D-115BU, a universal mounting plate, consists of a 2.25″ diameter rubber ball, connected at right angles to a flat 6.25″ x 2″ rectangular plate. The plate contains different combinations of pre-drilled holes which will match up to many electronic devices.Features:D size ball adapter for 9″-12″ fishfinder gimbal bracketsRAM Mounts ball and socket technology allows for near-infinite adjustabilityMade of Powder-coated, marine-grade aluminum for durability and reliability in the most demanding marine environmentsBacked by a lifetime warrantySpecifications:Plate Size: 6.25″ x 2″Ball/Socket Size: D Size (2.25″)Weight Capacity: Standard Use: 6 lbs/Heavy-Duty Use: 5 lbsMaterials: Marine-Grade AluminumAdditional 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.