... cutting efficiency 4) Longer tool life PCBN Inserts for cast iron and hardened steelGrade: FBS7000, FBS7500, FBS9000, FBS9500, ... for rough machining and semi-finishing of gray cast iron and nodular cast iron. FBS7500 1) Excellent wear resistance and heat ... Suit for semi-finishing and finish machining of gray cast iron, nodular cast iron, and other materials. FBS90001) Integrated excellent wear ...