AQUAPANEL Maxi screws are specially designed for fastening AQUAPANEL Cement Board Outdoor to metal and wooden substructures. Shank with a pointed tip and drill bit with countersunk head.The length of the bolt is L = 25 mm and is sufficient for double layer screed on the metal substructure. The screws have anti-corrosive surface protection, Climate X1, which guarantees a corrosion resistance of 1500 hours, tested by exposure to saline mist. AQUAPANEL Maxi self-tapping screws are suitable for metal profiles up to a maximum thickness of 2.0 mm.For fixing the AQUAPANEL Cement Board to metal and wooden substructures.