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Galvanized Type C Shaped Steel Beam And Purlin For Roofing And Column Perforated Unistrut Channel , Find Complete Details about Galvanized Type C Shaped Steel Beam And Purlin For Roofing And Column Perforated Unistrut Channel,Light Weight C Steel Purlin,Types Of Steel Beams,Galvanized Channel from Structural Steel Supplier or Manufacturer-Tianjin Tongying Steel Co., Ltd.