A concrete cover block is a small pre-cast block used in reinforced concrete structures to maintain the proper spacing between the reinforcement (rebar) and the formwork. It ensures that the rebar is adequately covered by concrete, providing protection against corrosion, enhancing fire resistance, and maintaining the structural integrity of the construction. Cover blocks are available in various materials, including concrete, plastic, and fiber, and are designed in shapes suited for different structural elements such as slabs, beams, columns, and footings.