Cloud Electronics CS-PI-10P Ceiling Pre-Install Tile Bridge (Pack of 10)The Pre installation bracket is for when the speaker is being pre installed into a Plasterboard ceiling, the optional pre installation brackets can be installed before the plaster is skimmed. The pre installation bracket provides a mounting solution to which wiring can be tied behind the plaster. This can also act as a cut out template when many cut outs are to be made in an installation, and it secures the ceiling speaker to the building structure.