A concrete screw is a type of screw specifically designed for fastening objects to concrete surfaces. It has specially designed threads that grip into the concrete as the screw is driven in. Concrete screws are often made of hardened steel for durability and are used with a drill to create a hole in the concrete before the screw is inserted. They are commonly used in construction and home improvement projects to securely attach items like brackets, fixtures, or shelving to concrete walls or floors.

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