... used to grind disperse super-fine super-fine powder Zirconia ceramic washer ,Zirconia Ceramic Ring ,Zirconia Ring ,Zieconia insulatorsThey are made of high purity and ... can be mainly used to grind and dispersesuper-fine powder.Zirconia has the highest strength and toughness at room temperature of ... tools, fixtures, tweezers, wire drawing rings, bearing sleeves and valves. zirconia ceramic washer