Manufactured for top performance in masonry-based applications, concrete screw anchors are designed to fasten objects into concrete, brick and block. The blue Perma-Seal finish on this tapper 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. The flat-head Phillips tapper concrete screw anchor is quick to use and easily installed with a matched tolerance drill bits. Tapper screws are perfect for interior and exterior projects. Use for light to medium duty applications. Various DOT approvals.