Cigarette Lighter
Most european cigarette jacks are slightly bigger than (China) manufactured 12v power adapters.
So in order to make a standard 12v power adapter to work in euro cars, the adapter manufactures include a small plastic sleeve/ring that is placed over the 12v adapter tip. This ring has a few cut out slots to allow the metal contacts to still make the necessary contacts in the cars socket.
Think of the sleeve/ring as a shim: 1mm bigger than the diameter of the adapter by 1" long. If you need to see an example, go by a Radio Shack or Best Buy to view there power adapters.
Keep in mind this only pertains to cigarette jacks, NOT TO 12V DC POWER POINTS
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