This does the job just fine. Fit onto my ConAir Silverbird.

At first I though it was loose and would have to tape it down to fit, but you just have to push it in so it's snug.

Does not fit all dryers

This diffuser has worked so well since I bought it a year ago. It does an excellent job of drying my hair in a short period of time, and is super easy to use.

I have a L’ange blow dryer. It fits perfectly. I like that I can adjust the air flow while using it.