You can make this for about $2 in about 5 minutes. It is a really easy and cheap way of making micro attachments for your shop vac to clean small and tight places. It will also work for household vacuums.
I personally use it for cleaning my computers in the shop, car detailing, cleaning cnc motors, and while working on automotive and small engines. After scraping gaskets on engines, for example, sometimes you'll get a few pieces down in the intake and this will take care of that. If something accidently falls in a carb or cylinder, it can help get that out as well. It also fits in spark plug holes, even on small engines.