 | ||
A toggle bolt, also known as a butterfly anchor, is a fastener for hanging things on hollow walls such as drywall.
Toggle bolts have wings that open inside a hollow wall, bracing against it to hold the fastener securely.
The wings are much larger than the bolt they are attached to. This spreads the weight of the secured item over a larger area, increasing the weight that can be secured compared to a regular bolt.
References
Toggle bolt Wikipedia(Text) CC BY-SA