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An expansive auger bit has an adjustable cutter, for boring holes of differentdiameters.
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 diameterhole.
NOTE:
Drill into an off-cut first to determine if the desireddiameter is correct.
Always keep the drill bit perpendicular to the workpiece.