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The RAM-139U consists of a medium length C size arm with a 2
This part will connect to 1/2" NPT Male threads
5" diameter round ball bases that contain the universal AMPS hole pattern
the included nylon threaded cap seals the bottom
RAM® Double Socket Arm - C Size Long RAM-138-UN7 The RAM-139U consists of aThe RAM 201U D consists of a long double socket arm that accommodates 1. 5" C size ball bases, device holders, and adapters. With an overall length of 9. 125", this is the longest C size RAM double socket arm size and adds more reach to your favorite mounting solution. The easy to adjust knob allows for near infinite adjustability.