A great tool for anyone who needs to find the center of something, especially unusual shapes or ones where the center is usually difficult to find. I do quite a bit of woodworking on a lathe, so I often have to find the middle. Prior to this purchase, it can be a little tedious to find the exact center with various other devices, which can result in the project being off-center. I believe they make 2 different sizes so make sure it works for your projects before you buy. A must-have item for manufacturers of all kinds.