It will not break perfectly on your score line every time, like in some of the featured videos. However, it does break very close to perfect, if not perfect, most of the time. It depends on the type of glass you're using and how deep you score. The product itself is the best and easiest option for cutting glass. I can do about 15 bottles in 2 hours with this tool.
I have not used these for any sewing projects which is why I gave only 4 stars. I've been using these for arts and craft projects with my kids, and they absolutely love them!
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