The E27 threaded lamp holder with switch in black thermoplastic material allows you to use a lampshade or any decorative element with a E27 fitting, regulating its high with the use of the two ferrules.
The switch allows you to switch on and off directly from the lamp holder, allowing the creation of suspension or table lamps even without a wall switch.
N.B. This lamp holder has a security system that, in order to protect you from electrical shocks while you are changing the light bulbs, does not allow it to unscrew.
If the necessity to unscrew it should present, it is possible to unblock it by pointing at the security flap you will find at the base of the lamp holder with a screwdriver, while you are turning the lamp holder.
Always ensure the electricity is switched off when dealing with the bulb holder.