... /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 24 UN LDC 16 ER 8 W LDC16 IR 24 W LDC 16 ER A 55 LDA16 IR 3.0 ISO LDA ... 16 ER A 55 LDC16 IR 3.0 ISO ...