Manufacturer Description The RAM-111B RAM Mount Marine Grade Aluminum Universal Plate has a 1.5 inch diameter rubber ball connected at right angles to a flat 6.25 x 2 inch rectangular plate. The plate has many 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.Features Warranty: Manufacturer's Life Time WarrantyCradle Design: Rectangular Plate to connect Marine GPS, CB Radios, Ham Radios and moreCradle Material: Black Powder Coated Marine Grade Aluminum PlateMount Ball Size: RAM 1.5 inch Solid Rubber Ball The plate can also be used as a base plate to support a RAM Mount.