I used these to replace mirrors on my 100w CNC laser machine at home. This machine is used about 2 hours a week and I have been using it for several years and have found that the existing mirrors need to be replaced. The new mirrors were easy to install and immediately improved the consistency of the cuts. I recalibrated the mirror angles before using, which certainly helped, but the machine runs like new again. I cannot vouch for the durability of this product, I just don't know how well they will last. .
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