After some searching and reading tests and opinions I have now decided on this. There are only a few sets that contain a 4 mm drill, but I use from time to time. That are the most needed drill with 6mm equal to 2 in it, is not bad either.
Even though I may never need to drill 12mm, the set is still cheaper than buying individual good drill in all of these sizes at the hardware store.
Even if I have to drill no granite:
With these drills and also my new Hitachi DV 18 DCL 2 Akkuschlagbohrschrauber my larger and heavy impact drill has become completely redundant.
This purchase, I just like to the KEIL 307501110 HSS Cobalt twist drill DIN 338, in RoseBox 19 pieces, ø 1 - 10 mm / 0.5 increasing no regrets and there also does not hurt afterwards the slightly higher price compared to other sets.
