Kaiser 769,325 patisserie cake ring with handles, stainless steel, extra high, 9 cm, adjustable from 16.5 to 32 cm (household goods)
Unfortunately, the cake ring retains not the set size, but shrinks namely jerky again. So you have to resort to a trick and fix the ring. This works best with a clothespin that one clings to the upper edge, after having set the desired size. Of cours
