Material: These aerator keys are made of ABS, odorless, and safe to use, convenient to remove with a long service life 5 Sizes of Keys: These faucet aerator keys come in 5 different sizes: 16.5mm, 18.5mm, 21.5mm, 22.5mm, and 24mm. A variety of sizes meets your different needs, and there is always a size that suits you. Two pieces are included for each size for replacement. Note: Please measure carefully before buying Practical and Functional: This faucet aerator tool set helps replace or clean blocked aerators, effectively fixes low flow faucets, and restores smooth water flow Wide Application: With wide compatibility, the faucet aerator keys fit most standard aerators. Please check the size before purchasing. Includes 10 pieces to meet your needs for use and replacement Easy to Use: These aerator keys can remove most aerators. Replace or clean clogged aerators with this removal key to fix low flow faucets. The ABS wrench helps prevent scratches or damage during installation or removal, providing ease of use Color: Blue Material: ABS Package Contents: 10 x Faucet Aerator Key Blue Removal Wrench Tool (2 pcs 16.5mm, 2 pcs 18.5mm, 2 pcs 21.5mm, 2 pcs 22.5mm, 2 pcs 24mm) Only the above package content is included; other products are not included Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual item. Measurement allows an error of +/- 1-3cm