Have decided after reading reviews for this cleaning wave. It was the right decision. The diameter is stable with 9mm and slightly stronger than in many others. After only a few attempts the spiral went through 2 more bends. So really recommended for short distances, and the operation went without a 2nd person. This spiral I have found after long search, maybe there are not enough reviews. The essay, so the spiral is not reversible, which one can not expect in this price range. The handle is actually plastic, not wood (other review), but that is unimportant.
