The RAM-247U-4 is a clamp base with 1.5" rubber ball that will connect to rails up to 4" maximum in width.
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RAM 4" Max Width Clamp Base with 1.5" Ball (RAM-247U-4)
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The RAM-247U-4 is a clamp base with 1.5" rubber ball that will connect to rails up to 4" maximum in width.