What do the coloured stripes painted on the e file bits mean?

This is the designation for the “hardness” of the attachments. The globally accepted marking of nozzles, depending on the size of the grain of the diamond nozzles or the tooth of hard-alloy in its working part (graininess, roughness, hardness, “anger”) is as follows:

yellow stripeiminimumsuperfine grain
red stripeffinefine grain
blue stripemmediummedium grain
green stripeccoarsecoarse grain
black stripessuppervery coarse grain
two black stripeseextra coarsesuper coarse grain

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