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Introducing the Red Head Concrete & Masonry Screw: 1/2 Dia, 4 OAL. Designed for maximum strength and durability, this screw is perfect for attaching concrete and masonry materials together. With a zinc-plated finish to prevent rusting, this screw delivers both style and dependability. It has a hex drive that allows for easy installation and meets the industry standard of ASTM B633 & ASTM B695. Applications include building construction, restorations, remodels and more. With its impressive oversized washer head design, you can be sure this screw will hold tight in any concrete or masonry surface. Order now and experience the quality of Red Head!