Parallax Instruments Standard Telescope Mounting Rings for 20.7" OD Tubes
These split tube rings, specifically designed for tubes with a 20.7" outside diameter, are made of die-cast aluminum, finished in gloss black paint, and lined with felt. The hinges, no-tool knobs, and hardware are made of stainless steel for long life and easy telescope installation and removal.
The rings are installed onto your mount or mount dovetail plate via a 1/4"-20 thread mounting hole that is drilled and tapped in the flat boss on the bottom of each ring. A similar hole is drilled and tapped on the top boss so that accessories, such as a piggyback camera mount, can be attached.
When you get to your shopping cart, please write what you are going to mount the rings to in the comments section. Most standard rings are in stock, however, certain mounting set-ups may require some custom drilling and thus shipping may take a little longer. Please call us at 1 (800) 483-6287 or email us with any questions. Thanks!