Alter the angle of the temple to the end piece on plastic frames.

Coarse cut on wide side while beveled edges are smooth to prevent accidental damage to eyewear. 7-1/2" long.

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Insider Info from Joshua

"Here is why you need a good set of files. All frames are made of plastic and/or metal. There are some adjustments you can only achieve by filing down the eyewear. Use files to open up the angle of temples. Remove material from a barrel or a drilled lens. Smooth the end of a cut screw. Reopen the driver slot in a screw head. Precision made in Germany and Switzerland."