CORE-HOLE DRILLING TOOL
A core-hole drilling tool is provided, comprising along with a tubular shank (2) also at least one extension (3), the wall thickness (D) and curvature of which correspond to those of the shank (2). Each of these extensions (3) is provided with a cutting insert (5). Since the width (B) of each of the cutting inserts (5) corresponds to the overall width of the annular surface area and this width is however only a few millimetres, the core-hole drilling tools according to the invention allow core-hole bores also to be introduced without any problem into workpieces of a material that has a hardness greater than 60 HRC.