dOvObArchitecture Arc De Triomphe Micro Building Blocks Set (2020 Pieces) Famous Architecture Model Toys Gifts for Kid and Adult

So which is it, micro or mini? Why are both terms used in the description when it has to be one or the other? Is a 2x2 plate 8mm wide or 12mm?

Are these compatible and interchangeable with Nanoblocks?

Are they compatible with Legos?

How big is the opening in the arch?