Diameter: 3/16-inch, Length: 3-1/4-inch, Head Type: Flat Head, Works in all masonry-based material including concrete block or brick, Use these screws for a variety of projects including fixing sill plates electrical equipment fastening 2-inch x 4-inch wood and many other fixtures to masonry, Climaseal blue coating is compatible with ACQ treated wood and delivers long-lasting corrosion and hurricane protection, Chisel edges accurately cut threads into concrete allowing for consistent driving performance and back holding power