The fischer metal cavity fixing HM is a flexible cavity fixing with metric screw for all panel building materials with a wall thickness of 3 to 50 mm. The plug is set in the pre-positioned installation using the installation pliers fischer HM-Z 1. The plug is pulled against the panel building materials using the pliers. The expanding arms swing open and press onto the reverse side of the board. Alternatively, installation is also possible with a screwdriver or cordless screwdriver. The fixture can be fixed and released multiple times thanks to the metric internal thread. The fischer metal cavity fixing HM is suitable for fixing lighting, pictures and light shelves indoors.