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 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" Thread Dia. mm: 4.2 Length mm: 32 Thread Length mm: 28 Head Type: Countersunk Wafer Recess Type: Phillips Point Type: Twin-Cut Driver Bit Size: PH2 Finish: Exterior Plus Material: Carbon Steel Max Drilling Thickness mm: 0.6Size 4.2 x 32 - 200 Pieces Timco Drywall Timber Stud Cement Board Screws PH Countersunk Wafer Twin-Cut in Silver