DEWALT Screw-Bolt+ Flat Head, 1/2" x 4" (Box of 50)

The Screwbolt Screw 1/2IN X 4IN (FLAT) is a self-tapping concrete screw anchor that threads directly into a pre-drilled hole in concrete or block, with no separate anchor body or expansion clip required. Made from zinc-plated carbon steel, it installs fast and can be removed if needed, making it a favorite for contractors hanging conduit, shelving, and fixtures, and simple enough for a first-time DIYer with a hammer drill.