Specifically designed for securing cement boards to steel dry-lining frames (up to 3.0mm), these screws ensure a secure and flush finish with their self-countersinking head. The self-drilling point, combined with a self-tapping thread, allows for efficient fixing into light-section steel. Featuring an exterior-grade organic coating, they offer outstanding corrosion resistance in damp or corrosive environments, outperforming standard fasteners. With the ability to withstand 1,500 hours in a salt spray test, they provide exceptional durability. Ribs under the head enhance countersinking for a clean, professional finish, while their A1 fire classification ensures compliance with rigorous fire safety standards.