Published on January 31, 2018
These connectors are the type that you might find inside a light fitting where they are not exposed to direct touch.
They are two pole connectors with a stainless steel spring-strip inside that can lock or release wires when the strip is pressed down by a button.
The ebay listing is and they cost either 99p for 1 or just 30p more for 20, which kinda makes it silly to buy less than 20.