toggle bolt

American  

noun

1. an anchor bolt having two hinged wings, ordinarily held open by a spring, for engaging the rough sides of a hole drilled in masonry or the inner surface of a hollow wall.

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Etymology

Origin of toggle bolt

First recorded in 1785–95

Example Sentences

With any anchor or toggle bolt, you can double the capacity by installing two anchors and running the picture wire over both of them.

From Washington Post