This part is the Oberhammer. It works so super awesome that it's hard to believe. It's really fun to scrape the whole long way to the house freely. It always work right away, with grass in the joints you have already a second time or nachkratzen from the other side again. But it looks from behind really great and you did not have to for hours on their knees. In addition, this quadrangular part works much, much better than the usual scratches with whom you really only one groove in the moss pulls into. Highly Recommended, everyone should have!