Miniature solid brass replaceable bi-pin lamp and globe. The total height is only 1.5 inches and the globe is 5/16th of an inch diameter. These lights were designed for 1/12th or 1” scale but look nice with 1/2” scale too. The glass globe is removable for easy replacement of the bi-pin bulb. They work with a typical 12 volt electrical system. I install them by drilling an 1/8th inch hole in the base and insert the two wires and brass stem of the light into the hole. Just a dab of glue seals the deal. Connecting the wires from underneath the base is the easiest.