This does not fit a standard American hairdryer
I’m kind of shocked at the reviews and question whether they’re real.  I received this diffuser a few days ago.  I primarily bought it to use in hotel rooms when I travel.  I tried it out on my hairdryers at home.  I own a Babyliss and the Dyson dryer.  I don’t really need it for home but it couldn’t fit over the nozzle of either dryer.  I also tried it on my daughters Dry bar hairdryer.  It didn’t fit.  I am currently staying in a hotel and it has a standard full size wall dryer and it doesn’t fit at all.  I’ve attached  pictures for size.  I only bought this diffuser based on the reviews.  This must only fit on a mini dryer.  That’s all I can think of.  Can’t report on how it works since I can’t use it.
Rating: 1 stars