The quality of this so-called "industrial and scientific" bit is below average. My analysis of this product showed that it had poor durability and quickly lost its sharpness. The only pro is that it was able to drill through concrete initially, but even that was not impressive enough to justify the price. On the other hand, the cons include the fact that it becomes dull quickly and isn't very durable. I would not recommend this product to anyone needing a reliable concrete drill bit.