Selling Cheap Building Iron in Tangerang. Iron is a metal that comes from iron ore (mine) which is widely used for everyday human life. Iron also has a high economic value. Iron is processed into building material products. Indo Bangun Buana shop sells WF Iron, Iron Plate, Wiremesh, Spandek Roofing, Bondek Floordeck, C Channel Iron CNP and UNP cheap and best quality.