This bit is medium grit ball shaped is used for hard skin & cleaning up the eponychium (the hard skin above the nail plate) or removing loose cuticle thats been lifted from the nail plate.
NOT for the natural nail! Refer to your e-file training or Russian manicure training for use.
Standard shank size 3/32" fits most e-files
Due to the nature of the Burrs use & required cleaning of them the lifetime of them is about 3-5 months.
For professional use only.