A cool product from Fimo, sadly discontinued so unlikely I will be able to source these anymore. A set of metal frames with holes all around the edge..
You can use these to make cool metal-edged beads by pushing the frame into a sheet of decorated polymer clay. They are very similar to the metal frames that Marty Woosley used in the wonderful online magazine "Polyzine" for a project. Click the webpage link below to go to that article and see how she uses a similar product.