Sky Tower Public Company Limited, together with its subsidiaries, provides infrastructure for electric power and telecom in Thailand and the Philippines. It operates through three segments: Production and Distribution of High Voltage Transmission Tower and Telecommunication Tower; Distribution of Industrial Product; and Telecom Implementation Service. The company manufactures high-voltage transmission towers, substations steel structures, and telecommunication towers, and also produces and distributes electricity poles, telecommunication poles, and electricity sub-stations. It offers telecommunication towers rental and consulting services, project management, planning, and installation activities, including equipment maintenance for communication and telecommunications, as well as technical advisory services. In addition, it provides galvanizing and steel fabricating services, and sells industrial products such as chains, sprockets, gears, gear motors, couplings, and conveyor chains under the RENOLD brand. The company is also involved in trading and investing activities, management of human resource functions, and manufactures and sells woodchip products. Formerly known as Ua Withya Public Company Limited, it changed its name to Sky Tower Public Company Limited in July 2021. Incorporated in 1967, it is based in Bangkok, Thailand.