Tweezerman Keychain Zip File
Practical, Retractable & Ultra-Portable
Use the thumb slide 'zip tab' to extend out and control how much of the file you want to use. Holding the case as handle, shape and smooth chipped or ragged nail edges. After repairing nail, you can retract file easily back into the carry case to protect it from bending or breaking (and from purse-fuzz or make-up gunk).
*Details provided by Tweezerman