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.

3. Annular cutters. Designed to cut large-diameter holes in thick metal more easily and more efficiently than twist drills or hole saws, annular cutters are considered to be industrial-grade tools.

Starting with the blade inserted into a through-hole, the saw slowly cuts a beautiful nested ... things do get a bit wobbly as the cut progresses, but in general the jig works wonderfully and ...