2 objects...

[tudoro]

1. Piece of shrapnel ? ...

2. Casing ID ... ?

[AZPhil]

The Casing ID.
CMC = Uzinale Metalwrgica di Corsa Mica SI, Cugir, Romania

7.92 = 8mm mauser. Made in 1939
Here is the site I use for looking up headstamps

Headstamp Codes - International Ammunition Association

The other piece looks like a driving band off of a shell. What size shell I cannot tell.

Semper Fi
Phil