Saudi Arabia. Zamil Steel's PEB plant in Dammam, Saudi Arabia' is loed on a 74,000 sq m site. The world's largest PEB manufacturing facility, it has a production capacity of 400,000 square meters of preengineered steel buildings per month. Zamil Steel PreEngineered Buildings Co. Ltd. 1st Industrial City Post Box 877 Dammam 31421 Saudi Arabia