Well, who drilled, he probably knows that it will be very problematic to drill a hole of large diameter at once. Nothing special. Why is it so good then? It went without a track, for good luck, so to speak. In general, marvel. There is no amount. To brag about the packaging, somehow stupidly. So this is, as it were, of better quality and a little more expensive. By the way, I ordered 2 from different sellers. Now they will attack, so with a shudder I am preparing to give answers in comments. to your questions. 12 mm, this is also, as it were, not a small diameter, I am generally silent about 34 mm. I have not seen a larger diameter on them. I don’t know if the numbers and the barcode can come in handy for someone, they will take something valuable for themselves. It is also a countersink. I have presented the smallest drill of this type sold, that is, from 3 mm, to 12 mm, in 1 mm increments. Also, with a small drill, there is more guarantee that you will get into the punched hole more accurately. The first one will probably be, why carrots? In general, there are large sets from 3 pieces to 5 in boxes and even suitcases. From another came in the second from the packaging, also in a plastic bag, not a https://jiji.ng/cars/nissan-almera tube, as I showed above. I decided to risk a review. In general, breaking the package, we see something like this. That is, one side with nominal diameters.

We make high-quality, fast holes, with a "carrot"

Came in a plastic bag, as usual. Carrot because this is a drill, which is correctly called a step, the people got such a drive. Yes, and it will not come out as beautifully as starting from a small diameter to an increase. In general, we open the tube and see this. I’ll throw in some photos. But there is already from 4 mm to 34 mm.