The Zieh-Fix bell must have a 6.0 mm recess (screw receptacle) lying transversely to the axis. This is guaranteed with the original Zieh-Fix bell from production date 10.2004.
The support washers serve as original washers for the original Zieh-Fix lag screws and improve the force distribution during the drawing process. At the same time, the support disks increase the tool life.
The support disks are subject to normal wear and tear, which however allows repeated use.