Optional Burrs for Diamant Grain Mill Get the exact grind you need from your Diamant Hand Grain Mill, Heavy Duty Easy to Use Manual Crank Coarse to Fine Flour Mill for Dry to Oily Grains, Steel and Iron, 56 pounds. Extra Coarse: For cracking grain for animal feed and cereal, 5-1/4"OD, 1 lb. If you are storing the grinding plates for several months in a humid environment, it's a good idea to coat them lightly with vegetable oil. With normal use, the grinding plates should last for many years. Note: These burrs work only with the Diamant Grain Mill.