Self-Drilling Cement Board Countersunk Exterior Silver Screws – 4.2 x 42

Specifically designed for fixing cement board steel dry-lining frames (max. 3.0mm). Self countersinking head for a secure and flush finish. Self-drilling point with a self-tapping 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 test.Self-drilling point for fixing to light section steel (Max. 3mm).Ribs under the head for improved countersinking.