The package includes: 12 faucet aerators with male thread filters (16.5 mm/18.5 mm/21.5 mm/24 mm) to fit different faucet sizes. 5 wrenches for the various thread sizes of the aerators. Easy Installation: The replacement faucet filter comes with wrenches that allow for installation and removal in minutes. No plumber is needed. You can do it in under a minute. Made of High-Quality ABS: The faucet aerator wrenches are made of durable, strong, and robust ABS. Long lifespan and difficult to break. Wide Application: The faucet aerators with flow restrictors can be installed on kitchen sink faucets, bathroom faucets, and basin spouts, and are compatible with Neoperl, Moen, Kohler, American Standard, Danze, and Groche threaded aerators. Anti-Splash: These faucet aerators thoroughly mix water and air to create plenty of bubbles and restrict water flow without reducing pressure. They prevent splashing and save water. An excellent tool for replacing or cleaning clogged aerators, effectively solving the problem of low flow and restoring a smooth flow.