Hi , This is a hinge so you can easily open a fly screen to open a window without removing the screen . However you can slide the screen out of the holders if you want to put it away for the winter . The hinges stay behind but are very low key if you print in a colour that matches the paint .I did not match colour obv's so you can see it but also posted a pic of a clear print !
When installing remember the hinges have to rotate so they needs to be about 7mm out from the window frame .
I used 7mm head 4mm shank by 15mm long countersunk wood screws .

Creality

Ender 3 Pro

No

No

0.28

75%

I printed these using CHEP's excellent fast profile . They printed in 14 minutes and were more than strong enough