The steel burrs of the WonderMill Junior can be used with any of the dry grains and beans that the stone burrs can be used with. In addition, the steel burrs can be used for oily or wet materials that would gum up and/or clog grinders that use only stone burrs or impact-style milling heads. In conjunction with its newly redesigned, highly aggressive feed auger, when using the steel burrs the Wonder Junior mill can grind nuts, coffee beans, herbs, spices, oilseeds like flax, fibrous materials or sprouted seeds or grains, cacao nibs, dried bone, alum and more. (The Wonder Junior is not suitable for grinding dried carrots or mesquite bean pods.) The Wonder Junior can easily be adjusted to grind coarse, fine, or anywhere in between. The steel burrs prepare you to easily turn out nut butters, grain flour, steel-cut oats, meal, cracked grain… the Wonder Junior equipped with its steel burrs has the widest range of grinding capability available. This burr set comes standard with the Wonder Junior Deluxe grinder. They’re exceptionally long wearing, so the original set will serve most customers for years. Purchase this set if you want a replacement or spare burrs.