Primarily used in drywall, the Drive Wall Anchor is a medium duty fastener for use in drywall, plaster and tile. The tip has a drive point to pierce drywall easily; no pre-drilling is required. The two prongs on the head of the shell, prevent the anchor from rotating during expansion. When the anchor is fully expanded, spider-like legs draw tightly against the backside of the wall. Once the body of the anchor is installed, the screw can be changed without disrupting the anchor.