The RAM-D-271U-2 round pipe base consists of a 2.25" rubber ball connected that will connect to a pipe tubing diameter from 2" to 2.5" in diameter.

RAM Rail Clamp Base with D Size Ball (RAM-D-271U-2)
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The RAM-D-271U-2 round pipe base consists of a 2.25" rubber ball connected that will connect to a pipe tubing diameter from 2" to 2.5" in diameter.