Product Specifications and Dimensions'' : Orifice diameter is 0.3mm; suitable for UNC 10/24 thread Quantity: 25 pcs/pack '' Material Brass Product Features'' : The atomizing nozzle is made of brass, with stainless steel holes, rust proof, durable and leak proof, the atomizing nozzle is the best choice for outdoor cold water use. The orifice of the stopper is 0.3 mm. Screw into any 10/24 thread atomizing nozzle opening. The material is brass body and stainless steel orifice, and is hand tightened with an O ring seal, making it rust proof, durable, leak proof, and durable in use. '' Voltage System''is widely used in outdoor cooling systems, agricultural irrigation systems, greenhouses, spray disinfection, epidemic prevention, air deodorization, purification, beautification, small fountains, etc. Excellent fogging effect! Each brass nozzle includes a leak proof, self sealing O ring; no tape or sealant required. So no extra tools are required, you just screw them into the 10/24 threaded atomizing nozzle opening.