These act as an easy way to mount misting nozzles inside mesh topped glass vivariums such as those manufactured by Exo Terra or Zoo Med. They are also compatible with Zoo Med Repti Breeze enclosures and Komodo Chameleon Terrariums.

Here is what the manufacturer says about their product:

Screen wedge made out of black plastic. Precision moulded to perfect 90 degrees, ideal for mounting adjustable nozzles in screen vivarium tops (ie. chameleon enclosures). 4 counter sunk mounting holes drilled on the sides and one hole drilled in the middle for the misting assembly. 

If you need help designing a system that will fit your particular situation, please contact us.