When a recipe says: Roll dough to 1/4" thickness, how can you be sure it is completely uniform? Now it is easy-as-pie! Just select the correct pair of rubber rings, slip them on the rolling pin barrel, and start rolling. You will get the correct thickness for cookies, pie crusts, puff pastry and biscuits. Included are four sets of color-coded rubber rings for 1/16", 1/8", 1/4" and 3/8". Rings will fit most rolling pins. Comes with easy directions.