This is a 2 piece D20 cookie cutter. It is in 2 pieces because that is the easiest method for making the cookies without having to fight to get the cookie out.

There are multiple ways you can use the two, but the suggested is:

1) Roll out a large amount of dough
2) Flour the dough and the cookie cutter
3) Press the Imprint into the dough
4) Remove the Imprint and then use the cutter to cut out cookie
5) Move the cookie to a tray using a spatula