This piece of kit is for Newtonian Telescopes. Specific details can be found on the Net. See
https://agenaastro.com/gso-2-coma-corrector.html
It is as new (Never used). Bought from Andrews Communications some time back and is currently shown as $149.
I have just removed it from its Box and Plastic for these Photos.
Yours for $85 including postage in Australia
Thank you.