Aerator key material: The faucet aerator keys are made of ABS, strong and sturdy, which can effectively remove faucet aerators Size: 4 pieces M16.5, 4 pieces M18, 4 pieces M21.5, 4 pieces M24, 16 pieces in total, with 5 piece faucet aerator removal wrench tools and 1 plastic wrench; sufficient quantity to meet your needs Fits most standard aerators: Our wrench tools are suitable for most common faucet aerators, practical and convenient for daily use Easy to use: With these aerator keys, you can easily unscrew your faucet aerator to replace or clean a clogged one, helping to fix low water flow issues Aerator key function: Helps remove most standard faucet aerators; please measure your aerator carefully before purchasing to ensure compatibility Material: Plastic Color: As shown in picture Package Contents: 1 set of Faucet Aerator Removal Tools (16 pieces total) Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.