A. Set contents: The set contains 12 faucet filter cache aerators. There are metric sizes of 16.5mm, 18.5mm, 21.5mm, and 24mm, which may meet your requirements for different faucet sizes. Additionally, there are 5 cache aerator wrench tools for disassembling and installing cache faucet aerators of various sizes. B. Easy installation: The replacement parts for the faucet filter come with a wrench tool. You can likely complete the disassembly and installation within a few minutes without hiring a plumber. It might be done within 1 minute. C. Durable material: The cache faucet aerator key is made of ABS, which is relatively strong, long - lasting, and not prone to damage. D. Wide applicability: The flow - limiting insert - type faucet aerator can be installed at the nozzles of kitchen sink faucets, bathroom faucets, and washroom faucets. It is compatible with Neoperl, Moen, Kohler, American Standard, Danze, and Groche cache aerators. E. Anti - splash function: These mixing faucet aerators can mix water and air to produce a number of bubbles. They can limit the water flow of the faucet without reducing the water pressure, help prevent water splashing, and save water. This is a good set of faucet aerator tools for replacing or cleaning clogged aerators, which may effectively solve the problem of low water flow from the faucet and make the water flow smoother.