These are very accurate and well made Brad Point drills, they work perfectly and the guide is perfectly centred. If you're going to use them with a rotary tool, you'll need a "drill stand". A rotary tool is not suitable for drilling objects larger than 1/4" and even a 1/4" tool weighs it down a bit (you have to feed very slowly and use a high speed, which is not for durability is ideal). a little). For non-production, occasional use, with stand; These bits cut very clean and precise holes (even