T Ring for Canon EOS cameras that can be used to connect your camera to a prime focus adapter for prime focus astrophotography or for photography using a microscope.
T Ring is brand new, never used, metal, and still in original packaging. Asking $12.00 plus $3.00 shipping anywhere in North America. I'll cover the 3% Paypal if you would like to pay using them.
This is a high quality adapter at a fraction of the cost of the same item at a camera or astronomy store.