As a result of using this product, I found that it broke so easily even at moderate pressure. These bits left rough and jagged edges on the metal making it hard to get a professional finish..
Pros
Unlikely to break in storage
Cons
Not efficient and reliable for industrial and scientific use.
So weak and fragile. I use 1/8" drill bits every day for work and have tried many brands over the years but I have never come across one as useless as this one. I promise you will be disappointed if you don't just use them on VERY soft material.