"The RAM-B-166-2-AU-NB consists of a 2.75"" suction cup twist lock base and SHORT length double socket arm 1"" ball diamond bases. The suction cup base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. The mount is designed with a RAM 1"" diameter patented rubber ball and socket system that has adjustment points at both ends of the double socket arm; this allowing for almost infinite adjustment and perfect viewing angles. The socket arm is compatible with all 1"" ball bases and adapters."