FIELD: material working; in particular, can be used for cutting-out of inner cavity of circular drilling parts. SUBSTANCE: the tool has a hollow body in the form of two telescope-joined pipes 1 and 2 with cutting members 3 and 4 on the working end face of each pipe. One helical groove 7 open on the side of the ring of cutting member 3 is made in the wall of pipe 1 that is smaller in diameter, throughout its entire thickness. The cross-section of groove 7 is trapezium-shaped. Helical groove 7 communicates with closed helical groove to made in the wall throughout the entire thickness in pipe 2. EFFECT: improved design. 2 cl, 6 dwg
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