... :11ER/16ER/22ER 11IR/16IR/22IR etc.. Items are ISO,A,AG,G,W,UN,NPT,ACME,API carbide internal & external threading ... ARE 11ER/16ER/22ER11IR/16IR/22IR etc..Items are ISO,A,AG,G,W,UN,NPT,ACME,API et1.tolerance below +0 ... ISO LDC16 ER G 55 LDA16 IR A 60 LDA16 ER 1.25 ISO LDA16 ER G 55 LDC16 IR A 60 LDC16 ER ... 1.25 ISO LDC16 ER G 60 LDA16 IR AG ...