I picked up this tool a while back.

http://i486.photobucket.com/albums/r.../PICT2082e.jpg

I think it is a threading plate. Sizes marked are 13, 14, 15, 16, 17, & 18,
the second digit being a little smaller and superscripted. Are these tenths
of mm. and does someone know how this tool is used?

Thanks, John.


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