The magnetic mount attaches to a piano's cast iron frame or other metal part, allowing you to easily position an ATM350a cardioid condenser instrument microphone with accompanying gooseneck exactly where you want it. Whether set up vertically or horizontally, the mount stays where it is placed, but can also be repositioned with ease. The AT8491P piano mount includes a screw to lock an AT8490 5" or AT8490L 9" gooseneck into the mounting socket, and its base is lined with felt to prevent damage to the instrument.