The RAM-261U is a swing arm with a 1/2" NPT hole on one side and a socket for a 1.5" diameter C-size ball on the other.

RAM Swing Arm w/ Single Socket Pedestal (RAM-261U)
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The RAM-261U is a swing arm with a 1/2" NPT hole on one side and a socket for a 1.5" diameter C-size ball on the other.