These are a replacement blades for the Glaser 404 Oscillating Hoe (Hula or Stirrup Hoe)
The Glaser oscillating hoe is made in Switzerland with typically good engineering.
Beveled shape gets under the edges of plants. Sharp corners tackle stubborn roots. Swiss galvanized-steel head with sharp, replaceable spring steel blade; 130mm or 175mm width. No handle
This Wheeled Seeder can be used by hand or attached to the Glaser wheel hoe (or planet junior).
Goosefoot Negative hoe attachment
Goosefoot positive hoe attachment for the Wheel hoe
These oscillating /hula hoes attach to the Glaser wheel hoe ( or Planet Junior) with 2 bolts
Glaser Wheel hoe is the most efficient human powered garden tool.