These blades are designed to cut polyisocyanate and styrofoam. They work great. No mess. It's not easy to keep a straight line, but it works better than a hacksaw blade, a pruning saw, a special table saw blade for insulation, or a razor blade. I believe they are only sold in packs of three. I only needed one. And spicy too. So the other two will never get used to it. I think my only complaint is that I had to buy three. Highly recommended.
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