Very good drills for direct drilling. That is, if you have opened a hole at 7mm and you want to open it at 8mm, it will grab you in the drilling process 100% and with a powerful drill it will twist you. However, for direct drilling, they are very easy to use even with the 10mm without any difficulty. The good thing about these specific drills is their durability, even in stainless steel, you can see that the titanium remains on top even after many holes. It also has a centering point in front that helps you for the beginning of the hole so that the drill does not deviate to the right or left. I highly recommend them.