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• Used to hold light sockets where design is not a concern. Often used in garages or basements, or as a temporary fixture.
• One type has a pull chain to turn it on. The other, a keyless lampholder, does not have a chain. Another type has a socket, two receptacles and a pull chain that turns off the lamp but not the receptacles.
• Typically is a round porcelain fixture with a socket with prewired leads ready for connecting to a circuit. It also has screw holes for mounting it to a box.
• Another type is the Pigtail. It is merely a socket with wire leads and without a fixture. It is also used for temporary lighting or for testing.