As a result of using this product, I found that it gave me mediocre results. The item looked and felt cheap despite its high price. Although it had a few positive features, it couldn't save the overall performance of the bit.
Pros
The bit is capable of drilling clean, flat-bottomed holes.
Cons
The bit loses its sharpness quickly and easily. Overall, the quality is subpar for industrial and scientific use.
Well made, although not particularly sharp. A quick swipe with a diamond grinder revived her. The shafts are not very long. The right price-performance ratio for everyday carpentry work.
My experience with these tools has been very positive. They work perfectly, are sharp and produce clean cuts. My only criticism of them is that I didn't want or need them to come with each piece in a separate wooden crate as it's just a waste of wood cluttering my shop.