Does someone know what this coin is,I don't know what the material, diameter etc

First of all, it's a roman coin.

Emperor appear to be Maximianus, there's a partial name readable.

At the back side, there are two standing figures and an illegible lettering.

With such worn condition, I wasn't able to pinpoint an exact ID.

But I'll link one that comes close, to get you an idea of how it would look like if it was in better condition: N#411344 .