I bought this for my current hairdryer. My old one kept popping off every time I used it. This one doesn't! THANKS AMAZON! P.S. The opening is 3", that goes down to 1". The 1" end squeezes the end of the dryer. The end of my hair dryer is about 2", & it works great...WITHOUT popping off. Hope that helps.
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The inside of the part that attaches to your hair dryer is like an expandable cup that grips around the top of your blow dryer, making it truly universal. The grip is STRONG and does not fall off nor can be pulled off. My blow dryer, I thought was very skinny, this mounted on it just fine. Highly recommend. Plus it's interchange with diff blow dryers. Try it!