Product Description No predrilling required. Use in wallboard or plaster to fasten mirrors, pictures, bathroom fixtures, curtains, etc. Fixtures can be removed and later replaced without disturbing the anchor. 100-piece. From the Manufacturer Primarily used in drywall, the hollow wall anchor is a medium duty fastener. Once the body of the anchor is installed, the screw can be removed and items can be changed without disrupting the anchor. The tip has a drive point to pierce drywall easily.