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 16″ Notched Disc Harrow Blade Dual-Punched 7/8″ x 1″ Round 11 Gauge 3 MM Round 49.95 Disc harrow blades and plow discs have a variety of uses to include discing, hilling, plowing, and turning soil.