The Hillman Group 375309 Flat Head Phillips Tapper Concrete Screw Anchor, 1/4 x 2-1/4-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. Tapper screws are perfect for indoor and outdoor use. For light to medium duty applications.