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I use them for my soldering flux brushes. I drill a hole in the top and stick the brush through so the bristles stay inside the container when closed. That keeps the flux from getting all over and keeps dust and debris from getting on the brush between uses. I've gotten years of use from these 'disposable' brushes this way. It's not that their all that expensive by I hate having to remember to buy more. I agree with the comments about using them for small parts not being much of an ible or hack.
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