Its large solid beechwood hopper holds 2 lb., 11 oz. of grain. All dry grains can be ground with the KoMo Mio mill, including soft or hard wheat, oat groats (dehulled oats), rice, triticale, kamut, spelt, buckwheat, barley, rye, millet, teff, quinoa, amaranth, sorghum, soybeans and dent (field) corn. It will also grind lentils, dry beans (pinto ...