I saw two reviews of this product on the home depot site, one lady was not able to figure out how to use the tool, she returned it and give it a poor rating due to inadequate instructions.
So here is a YouTube video to show exactly how it is used, it seems every product made should have instructions on YouTube to illustrate how to use it. Seeing a video for most of us is so much better than trying to read instructions (especially some of the ones written in foreign countries than make no sense).
I have never bought one of these still just use a file, or sharpening stone in the drill, but I have been tempted.
https://www.youtube.com/watch?...