[Material]-Made of brass with stainless steel orifice, rustproof and durable. Orifice diameter: 0.3 mm; Male screw diameter: 4.5 mm Leakproof-Each nozzle includes a self-sealing O-ring, no tape or sealant required. It uses a sturdy brass body with stainless steel openings, which is widely used in dust removal, landscaping, cooling, artificial fog and other humidification areas. [Widely used] -Textile humidification, industrial cooling, dust removal and moisturizing, textile plants, farms, and other low pressure cooling and humidification nozzles, Manufacturer: DollaTek