Quantity & Dimension: Includes 6 pieces faucet aerator inserts; Faucet Aerator Insert Size: 19 x 11mm/0.75" x 0.43"(D*H) ; Height: 11mm; Fit for Faucet Aerator: 22mm(Male), M20(Female); general faucet replacement part. Please check your aerator size before purchase Saving Water: When using the faucet aerator, the regulators save water flow and provide soft water flow, sufficient air bubbles to prevent splashing, and save water. Multiple Function: The faucet aerator can filter most of the sediment, lime and dross, with good seal so that will be no leak; Limit water flow to the faucet without reducing water pressure, prevent splashing and reduce faucet noise Application: Suitable for the installation and replacement of faucet fittings in homes, hotels, public facilities and other places, used to ease the water and good for water saving Water-pressure Adjust: Increasing water pressure. It can prevent water overflowed and the mixture ratio of the water with air is appropriate, which enhances water wallop, water becomes smooth and no splashing, cleaning more convenient. Easy to install and operate