I recently purchased a monolayer diameter milling accessory and was thrilled with the results. As a result of using this product, I found that my milling precision was significantly improved.The quality of my machined products has gone up dramatically. The con of this accessory is that it's quite pricey but the quality it adds to my work makes it worth the investment. Overall, I am extremely pleased with my purchase and highly recommend it to anyone seeking to improve their milling accuracy..