Use these screws for a variety of projects including fixing sill plates, electrical equipment and many other fixtures to masonry. Looking for an extra-long, heavy-duty screw to hold your projects together? Check out Grip-Rite's 1/4 in. wire x 1-3/4 in. L Phillips Flat Head Concrete Screws. These screws are made of durable steel and have a sharp, Phillips flat head that's perfect for sinking into concrete. They come in a handy 100-pack, so you'll always have plenty on hand.