CTD (aka Viking and Norseman) have been making quality bits and cutters for decades and I've been using them for about 30 years. These metric bits are no exception. Clean cut and sharp, well made and with a good standard index showing both millimeters and thousands. There seem to be only a few other decent mid-range metric bit sets here on Amazon, but they only fit up to 10mm. So if you need something more and don't want to pay inflated prices for other US bits here, this is the way to go. Each is the exact size. I immediately turned on the mic, knowing I probably didn't need it. The M7 hss they are made from is a great steel, it doesn't really cost more than a regular M2 but works a little better and is still cheaper than cobalt (and cobalt is often not needed). 135Β° separation angle and good tip design.