Tool room check perhaps? NH
They look like laundry tokens. I have had some that were ground dug (Austria), but I've no clue if these a real because I have seen fake laundry tokens for sale too.
Also, no SS connection: Note that they bear the Luftwaffe-pattern eagle and are marked to the Luftwaffe arsenal Erding.
I have moved this thread to the correct section.
Whatever its just an opinion.