Which case atx size is this one?

[RememberThe5th]

Hello , which case size is this?
Thank you.

It wonders me since its 24x24cm size but has 3 screws instead lf 4 as listed.

 

[stevenjemint]

I would guess Micro ATX looking at your image. What i would suggest you do it look at the board dimensions of each type of motherboard on something like amazon to be sure.