... and install all kinds of steel structure buildings. Lingshan Steel Structure Co., Ltd. Main Grade: Q345B, Q235B Standard: ISO9001:2000We are a Factory ... & Roof: EPS, Rockwall, PU sandwich, corrugated steel sheetDoor: Rolled up door or Sliding doorWindow: Plastic steel or Aluminum alloy windowSurface: Hot dip galvanized ... 'GP,40' GP, 40'HQ,40'OT or in bulk steel structure warehouse with ISO9001:2008