In a nibbling device comprising an oscillating nibbling tool, a guide and a drive for this tool, the punchings are conveyed in the direction of the nibbling device, the device can be placed in a central area of a plate-shaped workpiece which shapes the tool in a mandril shape, its free end is provided with a tip, in its end position it projects axially beyond the guide and that, viewed in the axial direction, a cutting edge is provided behind the tip.