Originally established around 30 years ago in 1991, Steeline is Australia's only national buying group of independently owned, metal roofing and steel building product specialists. Combined Group Purchasing Power As a national buying group, Steeline uses its combined purchasing power to achieve the best possible prices from our suppliers. The sheer volume of purchasing power aggregated by the size of the overall group provides each individual member with economies of scale that they would not have been able to achieve on their own.