If you are using a diamond hole saw bit, you can make your life easier by creating a wood template to reduce the risk of the ...

A hole saw is a ring-shaped saw blade measuring from less than 1 inch up to 4 inches in diameter and includes a drill bit ...

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.