RAM Mount Double Socket Arm w/Small Locking Knob f/1.5" Ball Bases [RAM-201U-BL] Hiking The RAM-B-166-TAB3U consists of a

The RAM-B-166-TAB3U consists of a double socket arm

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The RAM-B-177U consists of a double socket arm

Measuring scales:  Base plate: 1:24k

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RAM Mount Double Socket Arm w/Small Locking Knob f/1.5" Ball Bases [RAM-201U-BL] Hiking The RAM-B-166-TAB3U consists of aRAM Double Socket Arm with Small Size Locking Knob for 1. 5" Ball Bases The RAM 201U BL, standard double socket arm with small size 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;