I bought this because I needed a circular drawing tool with a perfect center. The "center" of the first protractor was off-center, so it couldn't be used. The seller contacted me and apologized for the poor quality of the product I received. They replaced it with a new protractor that lived up to its name: the perfect center point. I highly recommend this product for three reasons: it is extremely durable, highly accurate, and has great customer service.
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