or even ceramic tile requires a specialized type of cutting tool—the hole saw. A hole saw is a ring-shaped saw blade ...

allowing you to poke it through a small hole to make the hole bigger. In the days of skeleton keys, a jab saw was used to cut ...

It has a screw shaped end point. Not as clean cut as a twist or flat bit. It is used with a hand drill Wood Hole saw Comprised of a twist drill surrounded by a large circular tube with a saw teeth.