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Tighten the screw knob on the metal strap with a screwdriver until the strap has a firm hold on the rail
25" D size rubber ball and contains a variety of pre-drilled holes that are compatible with several large marine electronic devices
The RAM-101U-UK1 consists of an 18" long aluminum pipe with a drill-down pedestal base and a C size ball
The RAM-B-149Z-234-6U consists of a medium Length
but for best result
RAM® Double Socket Arm - D Size Long RAM-B-189-TAB3 Tighten the screw knob onThe RAM D 201U E, long double socket arm, has a socket at both ends that accommodates 2. 25" 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.