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The 5146 adapter provides a standard 3½" x 8 external thread for mounting various bases or other adapters, including standard surveying or optical alignment instruments.  It has three mounting holes for fastening the ring to virtually any flat surface.

You may also be interested in similar products such as the 235-6 (will accommodate an 800 precision lift) or the 235-18.

You can also see all of our other  instrument adapters on this website.