I was so excited when Amazon offered me this hole saw set to review, I actually had a craft project that I needed one for, this definitely is not just for electricians but comes in handy many times for plumbing jobs, crafts, and various do-it-yourself home projects. Just things like drilling hoes in an entertainment center for passing cables always drove me crazy trying to do with drill bits alone, when one of these would have made easy work of the job. For the project I was doing I needed an approximately 4" sized hole, and this kit included a saw that was just right, even though there were no instructions it was very easy to figure out how to attach the saws and my project was done in no time flat. The saws are a very high quality, as were the drill bits and holders included, this set definitely will last a lifetime if used properly. I was working strictly with wood, which the saws had no trouble handling.