ISO Metric | External Right Hand | 11 ER available on request. | | Insert Grade Description: | QMA (P20-P40/K20-K30) Coated. Sintered chipbreaker with a multi layer TiALN PVD coated sub-micrograin grade. Provides high quality threads for most materials including exotic alloys and stainless steels. Best performance is achieved at medium to high cutting speeds.