There are 5 key sizes available: these faucet aerator keys come in 5 distinct sizes, 16.5mm, 18.5mm, 21.54mm, 22.5mm, and 24mm, catering to various requirements. Please note that these keys are designed to remove aerators with serration and screw threads only. Make sure to measure carefully before purchasing, as they are not compatible with Moen faucets.
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