Keyless Candle Sockets are Edison base E26 often referred to as medium or standard base. Height is a short 2". Use on chandeliers and non-conventional lamps. When wiring, use included cardboard insulator to cover socket terminals. Cover socket and insulator with candle sleeve. Use with standard, Edison bulbs.
Before making any changes to electrical fixtures and/or 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.