22ER 4 API404 External Carbide Insert Cutting Tool for Steel Threading

22ER 4 API404 External Carbide Insert Cutting Tool for Steel Threading 22ER 4 API404​ threading inserts Features : Chip breaker : Superior chip management for excellent surface finishing, reduces cutting forces ;make sure of the surface smooth ; Grade : AS300 grade.New nano-PVD coating . Ultra-fine grain alloy maxtix with good wear resistance and toughness. Applicable to all kinds of steel , stainless steel, cast iron ,nonferrous metals and other materials thread turning