When I replaced the lighting in our pantry and closet I had to add a switch box to the wall as the fluorescent lights I replaced were actually their own switch box. I read several reviews before purchasing this product and I have seen people complain that the crown teeth wear down when using it and it doesn't cut a hole. I have no idea what these people did to grit their teeth. I followed the instructions and this product worked great. It cut the hole to the perfect size, it was very easy to use and all you have to do is follow the instructions. I love this product and will definitely use again when I need an electrical box. I made sure to include some photos of the crown and how it works in this review so you can see how it worked for me. I installed two of these and they worked flawlessly in both cases. Oh, and yes, there are still a few holes in the drywall from how the original builder installed the original fasteners, so I'll have to come back and patch them later. but that's a project for another day.