If you are a professional hole driller this set may not be for you. But if you (like me) have a random project that needs a nice clean round hole, this will likely get the job done, and at this price point you won't feel bad if your "investment" is for a few months (or years) dusty ). !) until the next project. My project was to install 2 sockets on 5/8" MDF shelves by 2.5". The first went like a hot knife through butter. The second faltered a little over halfway but finished the cut after a few minutes after a brief cool down. Generally a good set - no complaints for the price.