Manufactured for top performance in masonry-based applications, Hillman Blue Flat-Head Phillip Concrete Screw Anchors are designed to fasten objects into concrete, brick and block. The blue Perma-Seal finish on this Hillman Concrete Screw Anchor provides long-lasting corrosion protection. Its high-low chiseled threads allow for a steady drive and installation torque reduction. Its various features and state of the art design make this anchor an excellent alternative to expansion anchors, plugs and lag shields. Concrete screw anchors are used for attaching electrical equipment, 2 x 4s, flag poles, hurricane shutters, window installations and more Easy to use and easily installed with a matched tolerance drill bit (included) Perfect for interior and exterior projects Use for light- to medium-duty applications High-low chiseled threads cut into concrete allowing for steady drive and installation torque reduction Perma-Seal climate coating renders long-lasting corrosion protection Designed to fasten applications into concrete, brick and block