A great kit to keep a variety of all-metal bi-metal saws in stock. I had to cut 7/8" and 2 1/2" diameter holes from a quarter inch. I used a drill press to make the holes. It took a little effort to cut a larger hole, but I did what it took. I also had to replace the 2 1/2 hole saw but it was worth it to finish my project. This set is a bi-metal set and if used more for woodworking projects I believe the hole saw will last a lot longer than if stolen. The screen cover is positive. A case to keep everything together makes it easy to store and access for your next project.