Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5398073.

This is a bicycle cargo or bidon mount adapter for if you need more mounting points. You can insert standard M5 nuts into the adapter and mount it to the bike with M5 bolts through the slides or with T-Raps.

I do recommend gluing the nuts in place, but it is not necessary if you directly mount something on it.

If you have a carbon frame or fork, put something soft inbetween this and the carbon part.

I can recommend printing it with the nut insertion side towards the printing surface, as that would make using supports unnecessary