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The RAM 1.5" ball with 1/4" - 20 threaded hole. These attach to any standard tripod or monopod threaded screw. This includes the RAM-337U tripod adapter, RAM-201U 1.5" ball arm and the RAM-202U round adapter. The adapter has a standard AMPS pattern for attaching to many RAM cradles and laptop trays such as the RAM-234-6.
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