This ceiling cup extension is designed to create more space for cables when fitted on top of the original lamp cup. It can be used for various lamps, including Ikea's lamps. It can also be used to mount electronics to control the lamp such as Sonoff, Shelly 1, Zigbee products, etc.
The original cup must be between approx. 5-10 cm in diameter to fit over the hole in the bottom. The white cup in the picture is the one with approx. 5cm height, the black one is 3cm.
Depending on how the lamp is hung, you may need to extend the arrangement that the cable is hung on by adding a loop of string, wire, etc. to accommodate the cup extension while still being able to fit the original cup through the hole at the bottom of the extension.