... Disc and Notched Disc 4.Diameter:12"-30" 5.Excellent Wear Resistance Our Disc Blades are ... various diameter ranges from 12 inches to 30 inches with differing in concavity and thickness. ... 21/4 , 21/244/51/57/63215353.5/4.521/263225603.5/4/5/621/2 , 23/4 , 3 , ... 31/463/70/76/83235853.5/4/5/631/4 , 31/283/89246103.5/4/5/63 , 33/16 , 31/ ... 4 , 31/2 , 33/476/81/83/89/95266605/5.5/6/7/833/8 , 31/2 , 4 , 41 ...