20Pcs Misting Sprayer Nozzle Jet Mister Cloning Machine Hydroponic 360&iexcl;&atilde; Used wide suitable for DIY Hydroponic/Aeroponic/cloning machine syetem; garden/lawn sprinkle system; flower/small tree/greenhouse watering system. Connect: drill a 4mm hole and install it into Spray radius: 0.8-1.1m with recommended working pressure Inner diameter: 9/64''(3.5mm)/ External diameter: 11/16''(4.5mm) Connection: The spray head can be installed into about 4mm diameter hole or about 4mm inner diameter hose.