Disc Holder. # 26-1518, .574" Sq. Drive, Aprox 9/16"., Components For #12 Attachment:, #12 Knife Holder With Ss "S" Knife, # 26-1517, #12 Disc Holder, # 26-1518, #12 Shredder Plate, 3/32", # 26-1519, #12 Shredder Plate, 3/16", # 26-1520, #12 Shredder Plate, 1/4", 3 26-1521, #12 Shredder Plate, 5/16", # 26-2618, #12 Shredder Plate, 1/2", # 26-1522, #12 Greater Plate, # 26-1523,