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

Pack Quantity: 200

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.