Premium Grinder Knife Blade. .472" Sq. Hole, Hole Size: 12Mm X 12Mm, "10" Cast Into One Blade, Premium Grinder Attachments, #12 Knife, # 26-1139, #12 Grinder Plate, 1/8" Hole, # 26-1140, #12 Grinder Plate, 3/16" Hole, # 26-1141, #12 Grinder Plate, 1/4" Hole, # 26-1142, #12 Grinder Plate, 3/8" Hole, # 26-1143, #12 Grinder Plate, 1/2" Hole, # 26-1144