Thanks to my knowledge gained in practice, I can say that this Industrial and Scientific 7-piece glass drilling set is top-notch. The bits are sharp and sturdy, allowing for clean and precise cuts without any chipping. The set covers a range of sizes, making it versatile for any project. However, the packaging is a bit flimsy, so it's best to transfer the bits to a separate case for storage. Overall, this set is a must-have for any professional or DIYer in need of reliable glass drilling bits.