The Halo Diamond Infill Drill Bit (Medium) is for use with the Halo E-File Pro. The drill bit can be added to the E-File easily with its twist-lock design and is used to remove and lift acrylic or gel from the natural nail. It can also be used to smooth over the cuticle area after applying new product. This is an important step into creating the perfect base for a manicure or infill on your client.