The present application relates to a coupling device for a handle (3) of a medical tool (1) or medical power-tool chuck (30). The coupling device comprises a coupling-body (2) including a bore (6), a working axis (X) extending along said bore (6) and a seat (4) arranged at a first end (8) of said bore for receiving a tool-insert (10) with a central axis (Y) at an angle in reference to the working axis (X). The coupling-body (2) further comprises a protrusion (7) arranged within said bore (6), said protrusion (7) being configured to engage a groove (13) of the tool-insert (10) upon alignment of the central axis (Y) with the working axis (X). The engagement of the protrusion (7) with said groove (13) locks the tool-insert (10) within said coupling body (2).
