expansive bit

American  

Or expansion bit

noun

Carpentry.

1. an adjustable bit for drilling holes of different sizes.

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Example Sentences

The hole can be bored out with an expansive bit, or sawed out with a scroll saw, and filed perfectly round with a half-round wood file.

From Mission Furniture How to Make It, Part 2 by Windsor, H. H. (Henry Haven)

Punch a hole, with a nail set or punch, in the center of the circle to be cut, large enough to receive the spur of the expansive bit.

From The Boy Mechanic: Volume 1 700 Things for Boys to Do by Popular Mechanics Co.

Holes up to 3 in. in diameter can be cut quickly and accurately with an ordinary expansive bit.

From The Boy Mechanic: Volume 1 700 Things for Boys to Do by Popular Mechanics Co.

With an expansive bit bore a hole 3 in. in diameter through the block.

From The Boy Mechanic: Volume 1 700 Things for Boys to Do by Popular Mechanics Co.