The clio Plum Beauty Automatic Glass Nail File is excellent for shaping and finishing nails. The automatic movement cuts down on file time! As you continue to use this tool, the glass file won't wear down, so you can use again and again without reducing effectiveness. Unlike other nail grooming tools, this product won't tug, pull or snag your nails. It also helps prevents nails from splitting, cracking and chipping! Free batteries included!