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 and substations steel structures, and telecommunication towers. It also engages in the production and distribution electricity poles, telecommunication poles, and electricity sub-stations; provision of telecommunication towers rental and consulting services; and project management, planning, and installation activities, including equipment maintenance for communication and telecommunications, as well as technical advisors related to communications and telecommunications. In addition, the company offers galvanizing and steel fabricating services; and sells industrial products, such as chains, sprockets, gears, gear motors, couplings, conveyor chains, and others under the RENOLD brand. Further, it is involved in the trading and investing activities; and management of human resource functions. Additionally, the company manufactures and sells woodchip products. The company was formerly known as Ua Withya Public Company Limited and changed its name to Sky Tower Public Company Limited in July 2021. Sky Tower Public Company Limited was incorporated in 1967 and is based in Bangkok, Thailand.