Pigtail lamp holders - medium base for use in electrical equipment, harnesses, light strings and related applications. Wire leads are 5 in (127 mm) of color-coded stranded wire, stripped 1 in (25.4 mm) for easy connection. Rubber sockets have an extended lip to seal against bulb. Metal shell interiors are aluminum, 145 nickel-plated copper. 124 weatherproof socket has sealed leads where they enter husk.