this review title is: does not fit most dryers and the content is: i bought it specifically because so many people were saying it fit their dryers that were my brands unfortunately i got it took it out of the box to look at it did not realize my husband threw away the box when i was not paying attention and by the time i got it into the bathroom a day or two later and check if it fit with my blow dryers i did not have the box to return it i have three completely different hair dryers you would think it would have fit at least one nope it did not fit any of my three blow dryers i have a vidal sassoon conair and a revlon again they are all different and different sizes too it did not fit any of them i offered it to my friend i said just bring your dryer over tho to test it first hers different than all mine did not fit either i walked it over to three different neighbors and none of theirs fit i am so curious how this is fitting so many other peoples is there an attachment needed i am very dissapointed as it was not cheap so now i am out the money plus i still need a diffuser and this thing is rather large and taking up space in my drawer because i do not like throwing away anything new be careful when buying it apparently it does not fit many dryers at all.there are other information for this review, one is this reviewer did purchase it and the other is 7 people think this review is helpful.