... coated with TiN,TiCN,CrN ,ZrN or other same kind coating with hard diamond Configuration :ZJP-300 Roots pump ,2X-70 ... coated with TiN,TiCN,CrN ,ZrN or other same kind coating with hard diamond,which enhance the attachment with one another ... .This coating is also used to make watch,galsses,cooks and must be wear and hard. Cz-1200 metallization vacuum coating machines