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A 50mm cover block is a small precast concrete or plastic spacer used in reinforced concrete construction to ensure a consistent 50mm cover (the distance between the reinforcement bars and the outer surface of the concrete). 

A 75mm cover block is a type of spacer used in reinforced concrete construction to maintain the correct concrete cover—the distance between the surface of embedded reinforcement (such as rebar) and the outer surface of the concrete. 

The 40mm cover block is used to maintain a consistent 40 millimeters of concrete cover between the reinforcement bar (rebar) and the outer surface of a concrete structural element (such as slabs, beams, columns, footings, or walls). 

A 60mm cover block is a small concrete or plastic spacer used in reinforced concrete construction to maintain a consistent 60mm cover (spacing) between the reinforcement bars (rebar) and the outer surface of the concrete structure.

The  cover block is used to maintain a consistent 40 millimeters of concrete cover between the reinforcement bar (rebar) and the outer surface of a concrete structural element (such as slabs, beams, columns, footings, or walls).