Vintage B22 Bakelite Retro Edison Bulb Holder with Cord Grip

Bakelight B22/E27 Lamp holder with the cable Grip.

Black

Height: 7cm
Diameter: 4cm
Fitting: B22/E27
Plastic cable Grip.

This lamp holder has a security system that, in order to protect you from electrical shocks while you are changing the light bulbs, do 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.