expansion bit

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Definitions from WordNet

Noun expansion bit has 1 sense

expansion bit, expansive bit - a bit with a cutting blade that can be adjusted to different sizes
--₁ is a kind of bit

Definitions from the Web

Expansion Bit

A tool used in construction and drilling, an expansion bit is designed to create holes in materials such as wood or concrete with the ability to expand or contract to the desired size.

Usage:

As a Noun:

Sense 1: An expansion bit is commonly used in woodworking to create holes with adjustable diameters.
Sense 2: In construction, expansion bits are often utilized to pre-drill holes in concrete for anchor bolts installation.

Example Sentences:

I used an expansion bit to drill a hole in the wall for mounting our new TV.
Before installing the shelf, make sure to use an expansion bit to create the appropriate hole for the wall anchor.