( available at local craft departments) the diameter you want the thickness of the dough to be. I have found that for cookies, 3/16 inch rod is perfect. For Cinnamon Ornaments, 1/4 inch rod is best. Place a rod on either side with the dough between the rods. Keep the edges of the rolling pin on top of the rods. The rods will keep you from rolling the dough too thin or too thick.