ICCONS Type 17 Cyclonic is your screw of choice for roofing in cyclone effected areas. This premium class 4, type 17 screw comes with a 6 Star EPDM sealing washer and pressure plate assembly. ICCONS range of Cyclonix Screws have been specially engineered and proven suitable for Australia‚ôs most severe cyclonic regions. All screws have undergone extensive and fully independent testing by The University of Adelaide (EngtEST) and shown to meet or exceed all current relevant Australian Standards for both strength and serviceability. ICCONS Cyclonic screws ensure you have a technically sound screw with superior performance and corrosion resistance. Now APPROVED and REFERENCED IN THE NT DEEMED TO COMPLY MANUAL (DTCM).