I always purchase NACHI made for drill. There is no trouble in work.
It will be a waste as it is a waste, so it is disposable as it will be difficult to put out the center even if you regrin it at this size size. If it seems to be inexpensive, I think that the length of the grooved part may be shorter. If the straight part gets longer, the worry of breaking will be slightly diminished.
After all the Nazi drills are of good quality. I have patronized since long ago. You can use it with confidence. I will also use cheap drills, but cheap items are not good either. Now we are using only good quality products such as Nazis.
I bought it for making a pilot hole in order to cut the thread of M3 into an aluminum material with a width of 5 mm. I worked carefully while squeezing the oil, but I was able to drill easily easily. I felt easy to take the center because the moment the drill hit the material was good.
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