Material: These aerator keys are made of ABS, non-toxic, 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 meet your different needs—there is always a size that suits you. Two pieces are included for each size for replacement. Note: Please measure carefully before purchasing. Practical and Functional: This faucet aerator tool set helps replace or clean blocked aerators, effectively fixing low-flow faucets and restoring smooth water flow. Wide Application: With wide compatibility, these aerator keys fit most standard aerators. Please check the size before purchasing. The set includes 10 pieces to meet your needs for use and replacement. Easy to Use: These aerator keys can remove most aerators. Use them to replace or clean clogged aerators and fix low-flow faucets. The ABS wrench helps prevent scratches or damage during removal or installation, offering 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) Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1-3cm.