I purchased this router bit set for an upcoming project and was left thoroughly disappointed. Despite its claims of being "professional grade," the bits struggled with even basic cuts and quickly began to dull after just a few uses. Thanks to my knowledge gained in practice, I can confidently say these are not worth the investment. While the packaging boasted a sleek design and claims of high-quality industrial and scientific construction, the reality was far from it. Save your money and invest in a more reliable brand.