1. It is used for changing the original headlight bulb seal cap. <br>2. It can help preventing water, dust, moisture or other small things out from your headlights or fog lights and make sure everything working fine. <br>3. Allow you easy to install the after market headlight bulbs/Lamps, Xenon Lamp, Bi-xenon bulbs without modifying. <br>4. If your bulbs little bigger than the dust cover's hole, you can use a knife to cut off the hole to be little bigger. <br>5. Suitable for 50-70cm inner diameter.<br><br>