This is a Canon Mount Adapter EF-EOS R. I used it with an EOS R50. If you purchase it at the same time as another item, I will offer a small discount if you leave a comment. The Canon EF-EOS R mount adapter has a locking mechanism for stable attachment. - Brand: Canon - Model Name: EF-EOS R - Type: Mount Adapter - Features: With locking mechanism - CE Mark: CE marked Thank you for looking.