Threading insert SIZE :11ER/16ER/22ER 11IR/16IR/22IR etc.. Items are ISO,A,AG,G,W,UN,NPT,ACME,API et Threading insert SIZE RANGES ARE 11ER/16ER/22ER11IR/16IR/22IR etc..Items are ISO,A,AG,G,W,UN,NPT,ACME,API et1.tolerance below +0.01mm~-0.01mm 2.Apply advanced coating technique 3.best price16 EL 1.5 ISO LDC16 ER AG 60 LDA16 IR A 55 LDA16 ER 1.0 ISO LDA16 ER AG 60 LDC16 IR A 55 LDC16 ER 1.0 ISO ...