Our 13mm low-cost indicating lights come complete with internal resistor(s) to match various AC and DC voltages. Each unit is provided with a dress ring/panel gasket to accommodate a 1/2-inch (13mm) mounting hole dimension and is designed to be mounted in panels up to 1/8-inch (3mm) thick. Conventional front panel mounting simplifies installation. Our 13mm indicating lights are UL Listed and are rated Type 4/4X as standard for watertight and corrosion resistance. In addition, light units are also listed for Type 1, 2, 3, 3R, 12, 13 and IP20.