Nail file

Emery boards are inexpensive and disposable, making them a sanitary alternative to metal nail files.

Emery boards are usually less expensive than metal nail files and so can be economically disposed of after use on a single person.

Surface scratches also alter the ball's aerodynamics making it more susceptible to spin and movement when in flight.

In a 1987 Major League Baseball incident, Joe Niekro of the Minnesota Twins was caught with an emery board in his pocket and suspended for ten games.

Marie Antoinette was known for her fondness with the lime à ongles, which was a nail file-like tool made of pumice stone.