A Concrete Cube or Box is a type of static fortification emplacement. Functioning in a similar manner to HESCO bastions, they are created with precast concrete and steel reinforcement. Rebar is the most common form of concrete reinforcement. It is typically made from steel, manufactured with ribbing to bond with concrete as it cures. Rebar is versatile enough to be bent or assembled to support the shape of any concrete structure. Carbon steel is the most common rebar material. However, stainless steel, galvanized steel and epoxy coating can be used to prevent corrosion.