expansive bit

or expansion bit

noun

, Carpentry.

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

Example Sentences

The locations of the players are designated by holes bored part way in the wood with an expansive bit.

From Project Gutenberg

With an expansive bit, holes can be bored in the block so that the rubber tubing will fit tightly.

From Project Gutenberg

This difficulty has been overcome by a very clever invention called the extension or expansive bit.

From Project Gutenberg

Such a hole would doubtless have to be bored with an expansive bit.

From Project Gutenberg