The RAM-271U-12 round pipe base consists of a 1.5" rubber ball connected that will connect to a pipe tubing diameter from 1.25" to 1.875" in diameter.

RAM 1.25" to 1.875" Rail Clamp Base with 1.5" Ball (RAM-271U-12)
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The RAM-271U-12 round pipe base consists of a 1.5" rubber ball connected that will connect to a pipe tubing diameter from 1.25" to 1.875" in diameter.