Self Drilling Drywall Anchor provides a secure hold in concrete, block, brick,plasterboard, and stone. Ideal for attaching brackets, drywall track, gutters, downspouts and electrical boxes, can meet your different needs. Nylon pipe and carbon steel zinc plated finished screw constructed, suitable for any acid and alkali environment. Do not need to pre-drilling holes. Harmmer-driven and screw-in the anchor and screw-in hook to expand and grip the mounting material. Quick, easy to installed and firm.