DNMG 150408-NF3 Insert Grade QX520 DNMG Turning Inserts 55 Rhombic Insert Insert Grades QX520 (ISO P10-P35 M10-M30 K10-K30) Coated. An excellent general purpose grade for medium roughing on Steels, Stainless and Cast Irons. Chip Breaker: NM5. Application: Med Cut. Chip Breaker: NM7. Application: Med/Rough. Chip Breaker: NR8. Application: Rough. GBP 0.00 1