1. It is suitable for H7 bulbs installation. 2. Please check the bulbs model of your car before purchasing. 3. Why need this adapter? Because the LED bulb can not be installed steady when you replace the origin car bulbs, but our adapter is design for solving this problem. 4. Material: Plastic 5. Fits for Mazda 3 5 323 / Kawasaki ER6-F 2002-2005.