BETER Nail file 4 in 1 Both sides allow you to cut, shape and buff the fingernails. File your nails following their natural shape and always file in the same direction.It is a perfect accessory to shorten, shaping and polishing your nails. Lima following the natural shape of your nails and always in the same direction. Directions of Use: File your nails following their natural shape and always file in the same direction.