Given the high ratings for this product, I decided to buy it and give it a try. The case that comes with the kit is cheap, difficult to open, and doesn't hold the bits in place well. But it works for the job - can't complain. However, the problem is in the bit itself. I took a 1/2" bit and tried to drill a shallow hole in the concrete. The bit broke on the first use. I drilled it and was able to drill a few holes with it afterward .Each time the drill broke more and more.I do not recommend this set, I will buy another set elsewhere.