This spring ring holds the bulbs in the MR11 spotlights.
This model is suitable for spotlights where the bulb passes through the front of the spotlight.
There is another version of the spring where the bulb passes through the back of the spotlight, see the associated products at the bottom of this advert.
Product description :
Spring ring for MR11 spotlight
Wire diameter: 1.2mm
Material: chrome-plated steel