GypLyner Universal Metal Stud Walls require the use of the GL9 GypLyner Fixing Bracket. The GL9 bracket keeps the GL1 GypLyner Lining Channel in place inside the stud partition wall by connecting it to brick or ceiling. They're shipped flat, but they're made of malleable galvanised mild steel. This means the brackets can be bent to encase the GL1 GypLyner Lining Channel to provide a more stable grip.