Precast concrete businesses manufacture concrete components in a factory or casting yard, where they are poured into moulds, cured and prepared for delivery to a building site. Products may be made to standard dimensions or designed for a particular project, with options for different surface finishes, colours, shapes and levels of reinforcement. Factory production allows components to be made before they are needed on site, helping coordinate construction work. Typical products include wall and floor panels, beams, columns, stairs, lintels, foundation units, retaining walls, paving, kerbs, drainage channels, manholes and concrete pipes. Some businesses also provide design support, technical drawings, delivery, lifting and installation, while others focus on manufacture and supply. Their customers include building contractors, civil engineering firms, developers, local authorities and landscaping businesses working on homes, commercial buildings, roads and infrastructure.