... specification)2)Length:6000mm(5800mm)/12000mm(11600mm)3)Available in 4mm,5mm,6mm,7.5mm,8mm,10mm,12mm,14mm,16mm,18mm.Also with ... twin-wall and triple-wall in 12mm,14mm,16mm,18mm ... city overhead highways.8)For agri culture greenhouses and sheds. 4mm-18mm polycarbonate roofing sheet