I am an electrician and have used this tool several times to cut different sized holes for electrical ceiling boxes. It works great and saves a lot of time compared to using a hacksaw. The only complaint I have is that although I've only used it to cut maybe 4 or 5 holes in drywall, the blades seem to dull very quickly. The tool hung several times on the last hole I used it on. I ended up having to try really hard not to snag it, which took a lot longer to finish the hole.