The Kennametal Carbide Inserts Style TNMA Grade 666 K21 are high-quality cutting tools designed for CNC, metalworking, and manufacturing applications. Made of durable carbide material and produced in the United States, these inserts offer excellent performance and longevity in demanding industrial environments. With a focus on precision and reliability, these inserts are a valuable addition to any workholding and toolholding system. Look at the pictures and decide for yourself. Email me with any questions.