The Hillman 376533 Power Pro Flat Head Concrete Anchor Screw is a specialized fastener designed for light to medium-duty applications in masonry materials such as concrete, block, and brick, as well as for wood-to-concrete fastening. Manufactured from heat-treated carbon steel, this 1/4" diameter by 2-3/4" long screw features a blue corrosion-resistant coating, providing enhanced protection, including AC257 treated lumber approval. Its flat head design, equipped with under-head micro-nibs, allows for flush countersinking and a clean finish. The screw incorporates a star drive for increased torque transfer and reduced stripping, along with wide, serrated threads and mid-crossband threads that ensure quick penetration and a secure, clean cut into base materials. These Power Pro concrete anchor screws are ICC-ES Code Compliant, with approvals for California Building Code, and Florida Building Code and Miami-Dade County Product Control pending.