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, 21.54mm, 22.5mm, and 24mm. A variety of sizes meets different needs, ensuring there is always a size that fits. 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 verify the size before purchase. The set includes 10 pieces to meet your usage and replacement needs 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 installation or removal, offering convenience and 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 21.54mm, 2 pcs 22.5mm, 2 pcs 24mm) Only the above package content is included; other products are not included Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm