The RAM-201MU-B, short double socket arm with metal 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. 

Dimensions: 
Overall Length: 3.5"
Socket-To-Socket Length: 2.25"

Material: 
Powder Coated Marine Grade Aluminum 

Ball Size: 
1.5" Rubber Ball Size 

Note: 
The "U" in the part number reflects product packaged in poly bag.