The supplied drill had an imbalance, so that the result was not satisfying. After about eight bores me the tip is broken off, even though I have quite carefully set and previously added the drill in rotation.
Even when used in a drill press, the result was not satisfactory.
The drills are refilled, but had no more imbalance.
I have nevertheless returned the set.
Unfortunately I have not yet found a replacement and would be grateful for tips.
