Good entry-level drill head at a great price. I missed the Allen key, but I still don't trust what comes with it. I also don't trust the hex head screws that come with the kit. They appear cheap and the hex head itself has many portability issues leading me to believe they will break quickly. But for €2 I got a good quality replacement at the hardware store. I have no experience with other drill heads, but with this unit it seems that adjusting the screw to shift the head doesn't achieve great hole size repeatability. I think I could drill a series of holes and get them all within .004-.008 of each other, but that might take some practice. Overall I got what I wanted and what I paid for.