I bought it to make the headlight of the type with the adapter attached to H7 valve to HID. There are also cheaper ones (some with protuberances), so it may be said that there are no price merits. However, the cheap one does not fit well if the bulb part is large and the headlight has just-clearance. Furthermore, the gap is also large and the risk of contamination of foreign matter is likely to be high. That point was perfect for Just H7 valve size. The slit through which the high-voltage cord passes is not too small, and processing other than simple burr removal is unnecessary. But the neck is a price. It is high. I do not have anything to replace so I feel like buying it.