You get all 3 discs and Rods to fit inside a Dairy Carton fits a 32oz side or one quart.  The hole will mount on the side, this way your can use bottles and extensions to center each layer.  The size is 2.66" by 2.66".  Each acrylic disc is cut with a laser. There is paper on both sides that peels off.

Pull Through Soap Tool Dairy Carton Set of 3 with Rods