Really very handy tool. When I replace all the trim in my house, this tool tells me exactly where to measure to cut the trim that fits the hook nose corner. It is very easy to use and will speed up your work. But here's why I didn't give it a 5 (and why the value for money is only a 3): First: Mine came with no instructions. Oh sure, it seems like it's meant to be intuitive, but there's nothing on it other than the instrument's label. And there are four small holes, two on each side. If you are