Abstract: A deburring mechanism with a rotatable countersink, a cylindrical shaft, a conical cutting contour and a cylindrical cutting edge configured to mount to a driven workstation shaft so that when a workpiece comes in contact with the cutting edge, burrs are removed from the workpiece. The deburring mechanism has a safety device attached to the shaft and adjacent the countersink. The safety device has a rotationally symmetric body with openings through which removed burrs move, a circular outer guard, a mounting portion with legs and a hexagonal mounting contour corresponding with an interior bore of the driven shaft and configured such that a driving connection of the countersink only occurs when the safety device is assembled and overlaps the transition area with a protective contour.