Package contains: 4PCS(2pairs) grinder nuts Product specification: The nut is made of quality hard carbon steel, outer diameter is 1.6"/41mm and inner diameter is 0.63"/16mm Easy to use: The product has high hardness, strong toughness and wear resistance can be used for a long time; Replaces part numbers: 224399-1 193465-4 224568-4 Wide application: The nuts are suitable for all 4-1/2inch, 5inch and 7inch grinders grinder nuts