This is an Apple genuine, used rear case from a Blue 2021 iPhone 13 6.1".

The edges have scuffs and nicks.  The rear glass has some small scratches.  The 5G side antenna flex cable is damaged at the connector where it would solder to the rear of the logic board.  The black cover over the MagSafe charging coil has a tear.  The old adhesive is still remaining in the edges where the front glass sits in place.  What you see is what is included.

No tools are included.