🔎 UNIDENTIFIED I keep finding these all over my parent's yard. Ring up as steelish...

[PluGGLife]

 

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[cudamark]

I've found those before too, but, I can't remember what they were from. End of a roll up window blind maybe?

 

[PluGGLife]

My brother just told me it's a nail washer for roofing tar paper

 

[paleomaxx]

And here's where I show my age : it's the metal piece in the middle of a 3.5" floppy disk:

 

[Bucket Lister]

And here's where I show my age : it's the metal piece in the middle of a 3.5" floppy disk:

IDK, but it's close. The only reservation I might have is the shape of the center hole keyway; it's not exactly (a) square, but that could have been a particular mfr./patent...

 

[Doubter in MD]

And here's where I show my age : it's the metal piece in the middle of a 3.5" floppy disk:

I call that a match.

 

[Gare]

what about washers for slate shingles