Chromed Brass Kitchen / Bath Tap Anti Splash Aerator - Outer Thread Width 28mm.28mm in diameter - Male Connection - Metal Nozzle ( No Plastic ) See Product Photos.Saves & Aerates Water Flow - Diameter Measurement is Based on Outer Male Thread.It Splits Down The Water Stream Into Many Smaller Ones - Filtration & Aeration.Anti Splash - Water Saving - High Quality Chromed Brass - Long Lasting Modern Design.Ideal Plumbing Replacement or Addition For Bathroom, Kitchen or New Installation Taps.