The Multi-Sharp Rotary Mower and Large Tool Sharpener fits on any power drill. This lengthens the life of your mower blade (you won't have to keep buying new ones) A blunt blade on your mower leaves a ragged cut. A sharp blade leaves grass with a clean, smooth cut. The specially angled wheel quickly puts back the edge on spades, hoes, lawn edgers and axes making them easier to use. You get a sharper blade in minutes. You don't need to remove the mower blade.