The invention relates to a holder (11) for a wall-ironing ring which has the feature that the centering ring is embodied as sizing ring (18) which is adhered with its whole radial outer surface to the peripheral surface of the annular recess and has a radial inner surface the form thereof is adapted precisely to the outer peripheral surface of the wall-ironing ring such that this can be arranged clamping or at least close fitting in the centering ring.
