This is a turntable drive motor for a microwave. It measures approximately 2 inches in diameter and is made mostly of metal. Located under the microwave turntable, also known as a microwave plate, it rotates the plate while the appliance is in use so your food items are heated equally and efficiently. If your plate will not turn or is noisy, you may need to replace the drive motor. This part is sold separately, and does not include parts such as the turntable coupling or plate. This is an authentic replacement part sourced from the original manufacturer.