CARBIDE THREADING INSERTS SIZE RANGES ARE 11ER/16ER/22ER 11IR/16IR/22IR etc.. Items are ISO,A,AG,G,W,UN,NPT,ACME,API et Carbide Threading InsertsSIZE 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 price DPitch(TPI)DesignationDimensionRight HandLeft HandLXYExternal3/8"1616ER16 ACME ...