Standard Pull Chain nickel lamp sockets have nickel plated shells and caps with set screws. Shells have Uno threads. Nickel pull chain sockets add a vintage look to lamps. Tapped 1/8IP, fits standard lamp pipe.
Before making any changes to electrical fixtures and lamps:
Disconnect plug/wire from the electrical source.
Turning lamp off will not protect you from electric shock.
If you are unsure how to safely proceed contact a licensed electrician.