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The RAM-201U-B has a short double socket arm, has a socket at both ends that accommodates 1.5" ball bases.
The RAM-201U-B by RAM Mounts has a short double socket arm, has a socket at both ends that accommodates 1.5" ball bases. A single spring inside the arm opens the end sockets, allowing you to pivot the ball and socket connection. This socket technology allows for almost infinite adjustment and perfect viewing angles.