I have one that looks like Lucite about 1/16th" thick, one side of
which appears to have been etched. The name is mostly worn
off. It says ???? Crystal File. Found it at a store that sells nail
files and stuff. It is very stiff and good for making flat stuff or
I suppose it could be used to hold against things you want to
round, such as a wheel mounted in a motor tool.
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