DFE-40 files (with soft foam layer) fit crescent base size 40, which is the standard crescent-shaped nail file base. DFE-42 files (thin, without foam) also fit crescent bases in size 42. DFE-51 files fit the short polishing base size 50. ATS and AT adhesive tapes are designed for straight nail file bases (size 20) and come either as a spare roll (ATS) or in a convenient plastic dispensing case (AT). Always check the base size number matches the file size number.

Peel the adhesive backing and align the file with the base, pressing firmly from centre to edges to avoid air bubbles. For tapes, cut the desired length from the roll and apply to the straight base. After use, grip the edge of the used file and peel away from the base. If adhesive residue remains, clean the base with a suitable solvent before applying the next file. Each file is single-use only — dispose of it after one client for optimal hygiene.

Grit indicates coarseness: 80 grit is extra coarse for artificial nails and heavy shaping, 100 grit is coarse for artificial nail work, 150 grit is medium for general shaping, 180 grit is universal for both natural and artificial nails, 240 grit is fine for smoothing and pre-coating prep, and 400/3000 grit is for polishing. For natural nails, always use 180 grit or higher to avoid damage. For artificial nails or acrylics, 80-150 grit files work best.

Disposable mineral nail files (sold in packs of 5 or 25) are designed for single-client use — dispose of them after each service for maximum hygiene. Laser nail files and reusable metal files should be cleaned with a brush after each client, disinfected with a salon-grade solution, and sterilised via autoclave or dry heat oven. Store all files in a clean, dry place away from direct sunlight to preserve the abrasive surface.