... /16ER/22ER 11IR/16IR/22IR etc.. Items are ISO,A,AG,G,W,UN,NPT,ACME,API carbide internal & external threading insert ... 11ER/16ER/22ER11IR/16IR/22IR etc..Items are ISO,A,AG,G,W,UN,NPT,ACME,API et1.tolerance below +0.01mm ... IR 3.0 ISO LDC 16 ER A 60 LDA16 IR 44 UN LDC 16 ER A 60 LDC16 IR 8 NPT LDC ... 16 ER AG 55 LDA16 IR 8 UN LDA 16 ...