Troldtekt structure screws are perfect for installing Troldtekt acoustic panels. The screws are specially designed to ensure a secure and stable installation. They are made of high quality steel with a galvanized surface, which prevents rust and corrosion. Troldtekt structure screws are easy to install and last for many years. 4.2 x 45 mm is a popular size for mounting Troldtekt panels on walls and ceilings.