I recently purchased a set of drill bits for my industrial and scientific needs and I must say that I was extremely impressed with their performance. Based on my experience, these bits have been able to drill through tough materials without any difficulty. The precision of the bits allows for accuracy when DRILLING, which is vital for my work. The packaging is also very organized, making it easy to sort and access the different sizes... The only downside is the price, but it's worth the investment considering the quality of the product..