Who We Are. News. An Ingredient Supplier. A Value-Added Manufacturer. Your International Partner. Grain Millers, Inc. Acquires ENRECO Milling Business. For more than 20 years Grain Millers, Inc. has been a leading manufacturer of conventional and organic whole grain ingredients used in cereals, breads, bars and many other products served around the world. These grains include oats , wheat , barley and rye , which we mill into flours , flakes , brans and fibers .