This is a replacement for original scope support. An autoguider does not need fine alignment, so save in unnecessary payload is welcome. If you need fine alignment, use here:
https://www.thingiverse.com/thing:4485265

Back to the subject, this one is to be assembled with two M4 thumb screws and hex nuts. Additional flocking paper to cover the nuts on the inside of the support will prevent scratching the scope.

The bigger version is intended for a Celestron 9x50 or 8x50 scope, and the small one for any generic 30mm f/4 scope.