RAM suction cups are regarded as one of the most impressive suction cups in the world. Their incredible holding power is surprising when considering how most suction cups function. When two suction cups are used together the performance is amazing. The RAM Dual Articulating Suction Cup is an amazing innovation in suction cup mounting. With the ability to independently articulate each suction cup, this mounting base can be used in a variety of applications such as curved windows and surfaces. Whether you are mounting to a curved surface on a vehicle, or a curved windshield, this product is the ideal solution for secure suction cup mounting. This mount comes with the standard length double socket arm with retention knob. A single spring inside the arm opens the end sockets, allowing you to pivot the ball and socket connection. The knob extension allows for easy adjustment of the mount and prevents over loosening of the knob. This socket technology allows for almost infinite adjustment and perfect viewing angles.