I think it is also a yarn store 
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I have 25 mm and whenever I want to use it but donāt have the yarn, I combine multiple balls and make a hat that takes about 5 minutes to crochet 
Itās pretty fun that way actually!
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Unfortunately, I donāt have one right now as I gave them all away over the holidays 
, but Iāll have to upload a pattern or something so you can see!
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My biggest is 9mm which is already pretty big in my opinion so your 25 mm is HUGE in comparison 
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Me too. I find that I also remember & can āvisualizeā MM sizing better than US sizing
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Like why is size L the same as _MM it will never make sense to me.
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I have a 30mm itās too big and Iāve never used it!
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I also have a 25 mm hook that I received as a gift along with some ginormous yarn a couple of years agoā¦ Still havenāt done anything with either! 
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I mean, what does that even look like? 30mm hook? I canāt even imagine!
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My biggest crochet hook is 12mm. I got it just so I could make storage baskets using recycled t-shirt yarn. I found it really difficult to use so I canāt imagine how hard it would be to use a 25mm one
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omg im dying ive ever seen a crochet hook that big
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the biggest I own is a 10 but ive never actually used it 
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The largest I have is Q17-15.75mm
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My largest crochet hook is a 10mm. Currently crocheting a beanie with it!
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The biggest one I have is a 20mm but the biggest Iāve used is an 18mm.
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