... AG,G,W,UN,NPT,ACME,API et Threading insert SIZE RANGES ARE 11ER/16ER/22ER11IR/ ... 19 BSPT LDC16 IR 16 W LDCAll our threading inserts are with PVD coating,all our ... processing stainless steel(grooving insert) or universal use(threading insert). LDC shows yellow coating,suitable for processing ... addition, we also can produce non-standard carbide threading inserts, CNC inserts and grooving inserts.The ...