Screw anchor
Encyclopedia
A screw anchor or wall plug (British term) is a fastener
Fastener
A fastener is a hardware device that mechanically joins or affixes two or more objects together.Fasteners can also be used to close a container such as a bag, a box, or an envelope; or they may involve keeping together the sides of an opening of flexible material, attaching a lid to a container,...

 that can attach one object to another in situations where screws, nails, adhesives, or other simple fasteners are either impractical or ineffective. Different types have different levels of strength and can be used on different types of surfaces.

Expansion anchors

These are often called "lead anchors" or "plastic anchors", and are used as follows:
  1. Drill a hole the same size as the anchor body.
  2. Push the anchor to its full depth in the hole.
  3. Insert the screw through the item being fastened and screw it into the anchor tightly.

Other types

Other types of anchors, designed especially for fastening to hollow walls, include toggle bolt
Toggle bolt
A toggle bolt 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....

s and molly bolts.
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