Grinders are great for dispensaries, retailers and head shops to offer consumers to consume their flower products. Here are some options for grinders:
https://www.mjbusinesstools.com/product/supplies/grinders-for-cannabis/
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For people in this forum, you need a big boy like this 
https://growershouse.com/commercial-cannabis-shredder-for-prerolls-and-extracts-110-cup-shredder
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Oh yeah those are great!
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For personal use, I still like my mini Cuisinart food processor. $19, lasts years and no carpal tunnel syndrome.
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Just ordered a custom Phoenician. I think theirs are the best, with Sharpstone (typo was SHARTstone hahahah!) a close second, if it’s the vibrating kind.
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You guys are going about this all wrong…see the KannaMill’s in the link below. You can control particle size much easier and is completely dust-free.
-Dan