"The RAM zinc coated u-bolt rail base consists of the 1"" diameter ball and socket system with RAM Universal 1/4""-20 thread centered on a 2.5"" diameter plate. This mount is designed to be a universal mounting solution for both still and moving cameras. The base has a 1.0"" diameter rubber ball designed to sit at right angles to the mounting rail. The zinc coated metal u-bolt and nuts included will fit a circular rail with diameter from 0.5"" to 1.25"". To mount the rail base, place the top of the base on the rail and then slide the u-bolt around the rail, into the holes in the base top. Now tighten the screws onto the u-bolt until the base is clamped firmly. If you desire, you can now slot the black composite covers over the exposed ends of the u-bolt."
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RAM Mounts RAM-B-149ZA-C1U RAM Mounts RAM-B-149ZA-C1U holder Passive holder Camera Black