The SDS Max-9 hollow crown or box sinker from Bosch is excellent for drilling deep holes for electrical boxes. The robust carbide surface with a fine grain ensures wear resistance during drilling. The asymmetrical carbide teeth adapt to the working pace, resulting in minimal noise levels. Thanks to the one-piece design, optimal power transmission from the tool is guaranteed. Due to the two-spiral U-shape of the shaft, this hollow drill crown is ideal for transporting drill dust as well as for breakthrough drilling.

Product information:
Compatible with SDS max drills.
Suitable for: high-density aerated concrete, bricks, clinker, masonry.