Disc harrow blades and plow discs have a variety of uses to include discing, hilling, plowing, and turning soil. Our eBay Store About Us Contact Us Add to Favorite Sellers 2 of 22″ Notched Disc Harrow Blade 1-1/8″ Square 6 Gauge 5 MM Thick 159.95 Disc harrow blades and plow discs have a variety of uses to include discing, hilling, plowing, and turning soil.