Got this to try and get a little more life out of the blades on my yard tractor before biting the bullet and getting new blades, and while this isn't a miracle worker it does do the job admirally. If there are nicks in the blade (and I'm sure there is) this will not remove them, however it will help to put a better edge onto the blades. You must be careful not to spin this at too high of a speed though or you will risk bluing the blade and causing weak spots and a poor edge. A cordless drill will work well for this as will a regular corded one but a Dremel will not work good for this as it does not have the torque required to grind this against the blade. It does wear out fairly fast and you may get 2 uses out of it, 3 if you are lucky, but should be enough to get you through the mowing season before having to buy new blades. And the most important thing when using this is to PULL THE SPARK PLUG WIRE OFF OF THE PLUG so you don't risk having the motor start from you turning the blades!