Application:

An expansive auger bit has an adjustable cutter, for boring holes of different diameters.

A scale on the cutter blade indicates the diameter of the hole to be bored.

It is a must have for a woodworker who is required to drill an odd size diameter hole.

NOTE:
Drill into an off-cut first to determine if the desired diameter is correct.

Always keep the drill bit perpendicular to the workpiece.