This is a hygrometer/thermometer mount for the item in the Amazon link down below. This was made to mount on the inside of an enclosure (I use it for a filament storage box: PM me for more info) and M2 screws work for the holes just fine; it might be a bit tight to the point where it threads into the plastic a bit, but most will find that this can be used to their advantage, as no jam-nut is needed.

Screw Holes: 2mm Mounted Item: https://www.amazon.com/gp/product/B07FCPJRFH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1