A double beam screed is a specialized tool used in construction to level and compact concrete surfaces. It consists of two parallel beams, typically made of metal, that are adjustable in height and can span across a concrete slab. The lower beam is dragged along the surface of the concrete, while the upper beam acts as a guide to ensure a smooth and even finish. Double beam screeds are commonly used to achieve uniformity in large concrete pours, such as floors, pavements, or bridge decks, ensuring structural integrity and aesthetics in construction projects.