Made from 3/8" thick HDPE Sanalite sheets (picture kitchen cutting board material), these wedges are used to align a sled for particular angles.  The sled is used on a table saw (very carefully) to cut wood pieces from a strip of wood.  Those pieces have certain selected angles on them, and are placed together to form the most basic shapes, a circle.

Set includes one of each:

8 segment = 45 degree

10 segment = 36 degree

12 segment = 30 degree

16 segment = 22.5 degree

20 segment = 18 degree

24 segment = 15 ddegree

30 segment = 12 degree

48 segment = 7.5 degree

Picture shows the sled I made to use them with.  It is not included in the purchase. There are several options out there on the world wide web that you can model it upon.  In my product list is a PDF drawing of the one I made.  Free for you to download.  Please use care when making your own sled.