These parts have different sizes, which allows each of the nozzles to be connected to different vacuum cleaners. I basically wanted a nozzle with little straws so I could vacuum my kids' Lego boxes. The price for the whole set was about what I expected to pay for just the nozzle, so I thought it was a really good deal. That! Everything fits after trial and error. As for the attachment, the little straws have to fall out, so I have to squeeze them as best I can and control them with my other hand. It's not as comfortable as I had hoped. If you need this particular tool for a less stressful job than the one I'm taking on, be sure to listen to your vacuum motor! Mine sounded like it was going to be very strained due to the limited amount of air that can get through those tiny straws, and I had to open the pressure release slider on my machine's hose.
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