The Hillman Group 375308 Flat Head Phillips Tapper Concrete Screw Anchor, 1/4 x 1-3/4-Inch, 100-Pack State of the art thread design cuts into concrete Tapper screws are designed for fastening applications in concrete, block and brick Use Tapper screws to attach electrical equipment, two by fours, downspout straps, hose reels, flag poles, Hurricane shutters and more BLUE Parma-Seal coated For use with treated lumber Building code approved