The RAM-B-201-A, short double socket arm, has a socket at both ends that accommodates 1" ball bases. This socket technology allows for almost infinite adjustment and perfect viewing angles. 

Dimensions: 
Overall Length: 2.38"
Socket-To-Socket Length: 1.75" 

Material: 
Powder Coated Marine Grade Aluminium 

Ball Size: 
1" Rubber Ball "B" Size 

Note:
For security purposes a locking knob is available for this arm, part number RAM-KNOB3L