Koyo International Limited, an investment holding company, provides integrated mechanical and electrical engineering services in Singapore. The company operates through Mechanical Engineering, Electrical Engineering, and Facilities Management segments. It designs and installs air-conditioning and mechanical ventilation, plumbing and sanitary installation, and fire prevention and protection systems, as well as integrated systems; and high and low tension electrical distribution, communications, audio-visual, and securities systems. The company also provides maintenance, repair, and replacement services for commercial buildings, hotels, schools, and universities; supplies construction materials, including reclamation sand, construction sand, armour rock, granite, and other aggregates; and undertakes environmental engineering, building construction, air-conditioner mechanical ventilation system, installation and engineering works.