Bosch Professional Plus M16 340 Mm Crown Stem

Excellent invoice and durability, but I could no longer disassemble the cup once it was screwed on, even using the hammer drill.

The Bosch Pro quality delivers on its promise. I performed several core drills in very hard, metal‑reinforced concrete using a 60 mm drill head in a wall about 400 mm thick. The mounting sleeve held up very well, with no signs of deformation or damage. It’s worth the money and I highly recommend it.

The mounting shank was too weakly dimensioned, or there was a material defect. During work with the mounting shank using the Bosch Pro Hohl-Bohrkrone SDS-plus-9 Core Cutter 100 mm, the shank broke in two. It was drilled into structural concrete. Wall thickness 180 mm, drilled from both sides. The sa… Read more

…to the other. If the drill bit gets tired one day (not tomorrow but the next day), you can still drill the hole with a third bit. However, at that price they could have fitted four cutters onto the bit.