Indexable Carbide Insert - Smallest insert in the world for chamfering mill. Smallest indexable counter sink, diameter 7mm. The insert is dual-relief angle, specially edge honing and optimized coated for high cutting speed. NC2032: AiTiN coating, very long tool life. For carbon steel, alloy steel, cast iron and hardened steel up to 56HRC. Each insert has 4 cutting edges.