Medium Duty 20 Blade Tillage Disc This hard worker is just big enough for the small farmer and just small enough for the home garden. This medium-duty disc makes planting the garden a pleasure. Features include a heavy-duty welded angle-iron frame, 10-18' x 3mm notched blades, 10-18' x 3mm smooth blades for better tillage, and heavy-duty sealed bearings. This hard worker breaks up 6-1/2' of soil on a single pass. Category I pins are included with purchase. This product features durable, corrosion-resistant powder coat gray.