Replacing accesary wrench is included.Get more flow. If you're on a well or have very low water pressure, these aerators will actually restore aeration.stuffed full be prepared for the water to rush out nearly unimpededNo more water spraying all over. Shaping the water stream coming out of the spout.Standard Size, General replacement part, Please check your aerator size before purchase To be More Healthy. Replace the old and impeded and disgusting aerators to have clean, clear water to drink.Item No.: Bubbler + Wrenchsize:18.5MmMaterial:ABScolour:Blue+blackPackage Contents:6 x aerators2 x wrenchOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.