Aerator key material: the faucet aerator keys are made of plastic, strong and sturdy, which can effectively remove faucet aeratorsQuantity and Size: faucet aerators size: 16.3 mm, 18.2 mm, 21.3 mm, 23.7 mm, 3 pieces for each size, 12 pieces in total, with 5 pieces faucet aerator key removal wrench tools, sufficient quantity can meet your needsSuitable for Partial Faucets: please measure the diameter of the internal thread of your faucet before ordering, and check which size of faucet aerators fits it; Note: only fits for female faucetsEasy to use: with these aerator keys, you can easily unscrew your faucet aerator out and then replace or clean the blocked one, fixing low flow faucetsAerator key: help remove most faucet aerators, please measure carefully before buying in case of unfit situation