DCMT Turning Inserts55 Rhombic Insert Insert Grade KC850M25-M45, P25-P45. A tri-phase coating on an extra strong, cobalt-enriched substrate. For heavy cutting of low,medium, and high carbon steels, as well as medium hardness alloy and tool steels. Excellent thermal and mechanical shock resistance makes this grade ideally suited for difficult interrupted cuts.Chipbreaker: LF. Application - Finish