Used for securing fibre cement profile sheets to light section steel (max. 5mm). Complete with heavy duty EPDM and stainless steel washer to provide a water-tight seal. Also known as a BAZ washer. Exterior corrosion resistant coating to withstand over 1,000 hours salt spray.Exterior plating gives a reliable and durable corrosion resistant coating which resists 1,000 hours salt-spray.Wings ream enlarged hole in roofing sheet to allow for expansion.Frequently used to secure Big 6 roofing sheets.