I sell jewelry, and it seems like everything is measured in millimeters, or mm's.  If you're like me, you snoozed  through metrics in school, cuz who needs 'em, right?

   Here's how to convert those exasperating mm's to sensible inches...grab a calculator (it's easier).....multiply mm by 25.4. That's it!   So 6 mm is now 0.24", or just shy of a quarter inch.