We share some advice on choosing a reliable nail file, the right grit for the right task and steps in creating a manicure. Any nail technician can do the full range of nail services with just four basic nail files: a coarse file for shaping acrylic and taking the length or surface down quickly; a medium file for smoothing artificial nails and shaping artificial and natural nails; a fine file for finishing artificial and natural nails; and a buffer, or microabrasive, to buff and shine the nail surface.