... and weather resistance.3. convenient for installation. Sandwich panel: each side of the panel is high qualified steel sheet, and ... Specifications:1. Groove and tongue, wedged connection between panels makes installation easy, time saving, material saving, higher strength, smooth2. ... ,other options are available under request3. Width (mm): flat panel:950,1000,1150,1200 Corrugated: 750,820,840,950, ...