Specifically Designed For Fixing Cement Board To Timber And Thin Sheet Metal (Max. 0.6Mm). Self Countersinking Head For A Secure And Flush Finish. Twin-Cut Point With A Hi-Low Thread. Exterior Grade Coating For Superior Corrosion Resistance In Damp Or Corrosive Environments When Compared To Standard Fasteners.Organic Plating Withstands 1 500 Hours In Salt Spray TestTwin-Cut Point - Ideal For 6Mm Tile Cement BoardsFixing To Timber And Thin Sheet Metal (Max. 0.6Mm)Twin-Cut For Rapid “Pick-Up” And Reduce TorqueRibs Under The Head For Improved CountersinkingFire Classification - A1PTDTIM217789