Buff and shape the edges of your nails using a Diamond Cosmetics® Wide Board Grinder Professional Nail File. The pack contains 2 files with different grit levels: coarse and medium. Grind acrylic nail extensions with coarse grit. The medium grit of the Diamond Cosmetics nail file aids in shaping medium-thickness extensions, such as most tips and wraps. The professional nail file 2-pack includes 2 files It's suitable for artificial nails, tips and wraps The wide nail file pack has both medium- and coarse-grit files