Galvanized steel 6 mm diameter anchor made for multiple use for non-structural cracked & Uncracked concrete. The head of the ceiling anchor rests wide, covers neatly and has an expansible split part on the other side. Suitable For Fire Rated Systems. They are specially used for fixing off hangers, brackets, and all kind of drywall profiles to concrete slabs where high workload, safety and extreme rapidity of installation is required.