Tool holder for fast assembly / disassembly of a ring of coring (2) with a flange internal thread (3) hollow, freely rotatable, for the axial fixing, a guide means (4) coaxial and transmission means torques (5), characterized in that the guide means (4) side end tool is associated, on the machine side and axially spaced, an outer conical surface (6) tapering in the tool side and between the average transmission torques (5) is arranged.
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