expansive bit

Or expansion bit

noun

Carpentry.

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

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 Project Gutenberg

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

From Project Gutenberg

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 Project Gutenberg

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

From Project Gutenberg