You will get 18 Pieces With a FREE KEY FAST FREE SHIPPING Over 5000 Positive Feedbacks I also sell these in other combinations if you need more. I also sell the Key by it's self. So check out my store :) These are a name brand NIAGARA and NOT A CHEAP PLASTIC replacement. Great for rentals, hotels, motels, or public faucets where tampering, theft, or removal are of concern Reduce water usage while optimizing your water pressure, whether it’s too high or too low. Rinsing your hands—or a toothbrush—is quick and efficient. The pressure-compensation technology helps you conserve expensive hot water, even though it continuously provides a powerful spray. These aerators stand up to years of use, so you accumulate considerable savings. With their Brass construction and durable chrome plating they will last for years. Uses only 1.0 GPM Provides safer drinking water than other aerators since chrome completely covers the all-brass construction Delivers a pressure-compensated, circular “needle” spray with many small streams Fits most female-threaded faucets (this aerator’s thread sizes: male 15/16”-27) Ward off vandals—only with a special key (included in package) can anyone remove or install the aerator