Sometimes you need to drill a hole through a 20x20 aluminium extrusion and you don't own a drill press.

Print this out and you will get a good enough hole in the right place.

The Fusion 360 file is here if you want to adjusted the hole size, this is an M8 hole.

https://a360.co/3dRYb3x

Print 100% infill it's a drill guide after all. I used PET but something firmer may be better.

Good luck.