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.

Making curved cuts, notches and holes in wood, metal and sheet plastic; Cutting carpet; Cutting asphalt shingles and ...

It’s important to note the motors and drives in metal cutting saws run at slightly slower speed, with more torque, than conventional wood cutting circular saws. Try to cheat by putting a carbide ...