2 pcs 18″ Disc Harrow 3.5MM 9 Gauge Notched For 1″ OR 1-1/8″ Square Axle Steel. 2 X Disc Harrow. Enhanced Soil Mixing Capability: The notched design enhances the plow’s ability to loosen and mix the soil, allowing for more effective blending with fertilizers, seeds, and other materials to promote crop growth.