The RAM-B-218-1U consists of a 1" ball and 0.25" NPT female thread. This part connects to any 0.25" NPT male thread including RAM-PF-585-X flex arm series mounts and RAM-PA54XX rigid arm series mounts.
RAM 1/4" NPT Female Threaded Hole Base w/ 1" Ball (RAM-B-218-1U)
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