A concrete nail is a type of fastener that is designed to be driven into hardened materials such as concrete, brick, and other masonry surfaces. These nails are generally made of hardened steel, which makes them durable and able to withstand the hard impact required to drive them into tough materials. Concrete nails are typically longer and thicker than traditional nails and have a more pointed tip which allows them to penetrate masonry surfaces more efficiently.

They may also have spiral grooves or flutes along their shank to help them grip the surface as they are driven in. Concrete nails are commonly used in construction and DIY projects for attaching items to masonry surfaces, such as wood framing, electrical fixtures, and baseboards. They are available in various sizes and lengths to suit different applications.