These 55mm screws fix floorboards through Gyproc Plank into the Gypframe SIF channel flange to prevent impact sound transmission in floating floors.
They're self-tapping for fast installation, and have a countersunk head to maintain a flat surface for easy finishing. They also have an electro zinc plating to prevent corrosion.
|StandardsEN 14566:2008+A1:2009,Mechanical fasteners for gypsum plasterboard systems. Definitions, requirements and test methods.