Makins Professional Ultimate Clay Extruder - This clay extruder has so many uses! It can be used for all types of clay. With the 20 disc designs you can create many different embellishments for your projects. To use, select the disc design that you want to use. Place the disc in the end of the barrel extruder. Soften a small amount of clay in your hands, roll it into a log, and insert it into the extruder from the bottom. Slide a design disc into the end, screw the end cap on, and then simply wind the handle down; pushing the clay through the extruder. The great thing about this extruder is that you do not have to push the clay through- simply wind the handle down. A very easy to use tool, suitable for clay artists of all ages! The discs for the extruder measure approximately 11/16 inch in diameter.