500 OHM 1/2 Watt 1/4″ square miniature Industrial Sealed Cermet TRIMMER POTENTIOMETER 10% tolerance (P1056). Horizontal mount top adjust POT. PCB layout is 5mm x 2.5mm. Used on Amplifone monitor chassis and many other monitor chassis and other applications. These are the exact fit for the application listed above but can also be used in many other applications where this value of Pot is needed.