Spirals!  These plates are 2 sided.  One side has a large Spiral, great for using the the large shape plates.  The other side has a trio of Spirals, configured to line up with the trio shape plates. A fun texture to add to your texture tool collection! Simply screw to the texture tool base, available in the of the store, and you have a parallel masher, that is truly parallel, with a texture.  Or add a shape plate, and you can make a well shaped bead with fun spirals on the surface.  

Trying to figure out how the plate system works?  !