Drywall Construction Timber Stud Cement Board Screws - Countersunk Wafer - Twin-Cut - Exterior - Silver Organic 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 test Twin-cut point - Ideal for 6mm tile cement boards Fixing to timber and thin sheet metal (max. 0.6mm) Twin-cut for rapid “pick-up” and reduce torque Ribs under the head for improved countersinking Fire Classification - A1 Specification CE Standard BS EN 14566:2008 Colour Grey Corrosion Rating (1-5) 3 - Urban & industrial areas with a low salt atmosphere Driver Bit Size PH2 Effective Thread L (mm) 21 Feature 1 Organic plating withstands 1,500 hours in salt spray test Feature 2 Twin-cut point - Ideal for 6mm tile cement boards Feature 3 Fixing to timber and thin sheet metal (max. 0.6mm) Feature 4 Twin-cut for rapid “pick-up” and reduce torque Feature 5 Ribs under the head for improved countersinking Feature 6 Fire Classification - A1 Finish Exterior Plus