The RAM-201LU, standard double socket arm with locking knob, 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. The locking knob, includes a brass 1/4"-20 thread; this
allowing you to disengage the screwing of the knob. Once you have set your mount in the location
you need, you can lock it in place and feel safe that your mounted device will stay right where
you left it.