... AG,G,W,UN,NPT,ACME,API carbide internal & external threading insert SIZE RANGES ARE 11ER/16ER/22ER11IR/16IR/22IR etc ... ,suitable for processing stainless steel(grooving insert) or universal use(threading insert). LDC shows yellow coating,suitable for processing steel.16 ... LDA In addition, we also can produce non-standard carbide threading inserts, CNC inserts and grooving inserts.The performance of our ...