What are these ?

[MarkAW]

I found them on my workshop floor. I have never seen then before. They are thin and made of metal. Some sort of shim perhaps. I did recently partly disassemble my cabinet saw to improve the dust extraction. I didn't see anything in the instruction manual's exploded diagrams

 

[dannyr]

shims for adjusting alignment, between clamped surfaces, especially under washers on machine screws/bolts