Review (1/5): not universal! 2 inches in diameter or less, measure your dryer now
Similar to MANY previous reviewers, this diffuser did NOT fit any of my hair dryers: I have three different brands, and the diffuser was just a half an inch small for ALL of them. DO NOT think that you will just get lucky, do the measurements on the hair dryers you own! They should be absolutely no more than 2 inches in diameter. I also find it suspicious that this measurement is nowhere on the product description on the Amazon site or on the packaging box for this diffuser.