MistKing Screen Top Mounting Wedge are made out of black plastic. They are precision moulded to perfect 90 degrees, ideal for mounting adjustable nozzles in screen vivarium tops (ie. chameleon enclosures). Each mounting wedge has 4 counter sunk mounting holes drilled on the sides and one hole drilled in the middle for the misting assembly. Available for the MistKing value nozzles only. See the Installation Instructions for the wedge in a ZooMed vivarium screen top.