I bought this cutter to round 78 pound corners. card stock. I figured three different sizes would fit me. In my experience, 4mm is no more than snipping off the end with toenail scissors and rarely works. 10mm sometimes works, but only if the paper is thick enough. The 7mm size works in most cases, but can be finicky. What I REALLY hate about this product is the lack of a garbage collector. If you don't put anything under the knife to catch the cuttings, you'll end up with tiny bits of paper everywhere. VERY ANNOYING! The cutter does a good job when it works, but that's pretty much a godsend. For $10, ALL sides of this product should have worked better, not just one. I really wanted to like this product, but I'm just disappointed and unfortunately I can't recommend it.
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