Rawplug All Metal Self-Drill Plasterboard Fixings which fit flush to board and can be used in double thickness plasterboard. Will also provide a secure fixing into lightweight and aerated concrete blocks. (NOTE. an 8mm pilot hole is required for this fixing). For use only with the screws supplied. Max Fixture Thickness 12mm (20mm Screw). Except RAW07130 Max Fixture Thickness 35mm (25mm Screw). Pack of 100.