Disposable nail  files are typically used for shaping and smoothing the edges of fingernails and toenails. They are made from wood and have a rough surface, usually coated with abrasive materials like sandpaper or emery board.

Here’s how you might use a disposable nail wood file:

1. Preparation: Make sure your nails are clean and dry before starting.

2. Shaping: Use the file to shape your nails according to your preference. You can file them straight across, rounded, square, or any other shape you desire. Always file in one direction to avoid damaging the nail.

3. Smoothing: After shaping, use the file to smooth out any rough edges or unevenness on the nail’s surface. This helps prevent snagging or peeling of the nails.

4. Finishing: Once you’re satisfied with the shape and smoothness, you can apply nail polish or leave your nails as they are.

Disposable nail wood files are called so because they are typically discarded after a single use or after a few uses, depending on the quality and durability of the file. They are convenient for personal grooming or for use in salons where hygiene and sanitation are important.