Not very good glasses, you have to press straight down to avoid sticking and they creak annoyingly too. If you don't like chalkboard nails. I find these pots very annoying because I want to dose the solvent without disturbing my train of thought. I would suggest you something like Eagle brand brass and plastic plunger pots which are perfect in every way. This is a good "second" glass when I'm working with others and they need a glass. At least they work.
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