High shiny chrome coating keeps scratch and tarnish-resistant for a lifetime of use. Easy to install with less complicated parts to reduce installation time. This tap aerator is designed to cut down on unnecessary water consumption from your taps Saves water and energy,Provides an even water flow Suitable for home,office,school,public places use Size: 16mm to 22mm Inside Thread adapter: 16mm to 22mm 18mm to 22mm Inside Thread adapter: 18mm to 22mm 20mm to 22mm Inside Thread adapter: 20mm to 22mm 24mm to 22mm Inside Thread adapter: 24mm to 22mm 26mm to 22mm Inside Thread adapter: 26mm to 22mm 28mm to 22mm Inside Thread adapter: 28mm to 22mm 16mm to 22mm Outside Thread adapter: 16mm to 22mm 18mm to 22mm Outside Thread adapter: 18mm to 22mm 20mm to 22mmOutside Thread adapter: 20mm to 22mm 22mm to 22mm Outside Thread adapter: 22mm to 22mm 24mm to 22mm Outside Thread adapter: 24mm to 22mm 26mm to 22mm Outside Thread adapter: 26mm to 22mm 28mm to 22mm Outside Thread adapter: 28mm to 22mm Package Included: 1pcs x Thread Adapter 2pcsx Gasket