Unbranded 1/2 in. x 4 ft. #4 Rebar

Rebar is a steel bar or mesh of steel wires used as a tension device in reinforced concrete and reinforced masonry structures to strengthen and hold the concrete in tension. Rebar's surface is often patterned to form a better bond with the concrete. When added to concrete, the rebar adds strength and flexibility, which concrete alone does not have.