The 3mm and 4mm drill not already exist for a working day, but leaves the fracture pattern of Borher close rather to a faulty operation, especially the narrower drills are most sensitive anyway. So this does not represent any criticism.
BUT: It seems to me as if these drills are not very sharp. A drilling in 6x6cm KVH with 10 drill was at least protracted than a classed as fixed already by me Holzbohrer. I can not say with certainty whether the drill is really dull, or whether this is due to the geometry of the double edge of this drill.
Furthermore, I find it very unfortunate that the drill set is not to buy into a tin case, as these hold also usually longer and there even would make sense to replace missing drill through new purchases.
For me, all in all a sobering. I will continue to buy low-Baumarkt cassettes. As I drive at least in comparison with this product better in the long term.
