The RAM-B-111U powder coated marine grade aluminum mount consists of a double socket arm mount one 2.5" diameter round base with 1" rubber ball and flat 6.25" x 2" rectangular plate. The plate contains different binations 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. Rubber ball socket technology dampens shock and vibration as well as allows for almost infinite adjustment perfect viewing angles. For most applications mount will support up to three pounds. Material: Powder Coated Marine Grade Aluminum Ball Size: 1" Rubber Ball "B" Size Note: The "U" in the part number reflects product packaged in poly bag. For mounting a GPS puck antenna to this mount RAM remends the RAM-338U Product : RAM MOUNT MARINE ELECTRONICS MNT GIMBAL BRACKET UNDER 5LBS Manufacturer : RAM MOUNT Manufacturer Part No : RAM-B-111U UPC : 793442101113