If you need to cut a perfect circle or smooth-edged hole into materials like wood, plastics, or sheet metal, it can be a real challenge. Not only do you have to have total control over the power tool you’re using, but you also have to be able to achieve perfect curves in 360 degrees — a task that can be nearly impossible with your basic saw. However, there’s one item you can add to your toolbox to make this task easier: a hole saw. A hole saw, which is a saw blade that’s already shaped into a perfect circle, can cut holes right into various materials. You can eliminate all of the difficulties when you use a hole saw, and you can even choose the diameter of these circular holes. Check out our picks for the best 4-inch hole saws right here.
