"Why doesn't Screwfix provide the most basic information about this product? At the time of writing, the only picture on the website shows the OUTSIDE of the box. There's no indication of what's inside. It turns out it's intended for halogen light transformers. Inside the box are some spring-loaded choc-block connectors with two rows of 4 terminals connected in pairs. You push a button to insert/release the wire. The trouble is it only takes very small diameter wires (1.5 mm2 max). So it was useless for my application. Also there's no cable grip. I had to return them and get choc box style boxes instead."
"What a good idea but impossible to get any wire into the connector. Maybe this is a bad batch but I had 10 to wire some downlights and they were a complete waste of time. Had to go and buy some conventional boxes."