Tools
What are these for?
I got these rings in an auction lot. The numbers in the graph correspond to the thickness of the rings from the ID to the OD.
Discussion
tehclanijoski
Apparently they might be for setting up a sheet metal press because those measurements correspond to standard sheet metal gauges expressed in inches
14 hours ago
3string
Is it a gauge set? You could measure the sizes of other round things, using these as a reference. The kind of tool you never even think of until you suddenly need it for critical dimensions on a run of 1000 parts
15 hours ago
Go/No-Go gauges, used in machining or manufacturing, for checking the dimensions of small parts. These gauges are used to quickly verify if a part's dimension falls within a specified tolerance range.
I'd agree with this. Specifically checking the chamfer of a part.