This part is made with 1/4 Clear Acrylic. The round part is 12" in diameter and is covered with a fabric that creates a "friction" between it and the plate you are working on. There are 4 positions that can be used while you paint. The first position is flat. The picture is in the third position.
The 12" diameter platform is attached to a 8-1/2" rotating disc that allows you to turn your plate 360 degrees.
There is also a Thumb Screw attached that will allow you to keep the rotating disc from turning when you need to paint in one area.