Aerator Key Material - The faucet aerator keys are made of ABS, strong and sturdy keys, which can effectively remove faucet aerators. Cache Aerator Removal Wrench Tools - The cache faucet aerator keys can only remove aerator with serration and screw thread. Refer to the product pictures. Easy to Use - With these aerator keys, you can easily unsrew your faucet aerator out and then to replace or clean the blocked one, fix low flow faucets. Fit Most Cache Aerators - Our wrench tools suitable for these brands, like Neoperl, Delta, Moen, Kohler, American Standard, Danze, Groche Cache Faucets Aerators. 4pcs of wrench cache aerator keys( M16.5 ,M18.5 ,M21.5 ,M24 sizes). Warm notice: Please measure carefully before buying