WHAT IS IT: Efficient, uniform mowing sets the stage for better raking, baling, and hay quality. And efficient mowing, even on rugged terrain, begins with Frontier SB31 Series Sickle Bar Mowers. USAGE: grass hay, oat hay, peanut hay, wheat residue, corn stalk, corncob, rotary straw, silage, or soybean residue. BENEFITS: These rugged implements flex up to 90 degrees or as low as -45 degrees to handle the ups and downs of hilly fields. Adjustable skid shoes control the working height.