Ceramic inserts are cutting tools made of ceramic materials, such as aluminum oxide or silicon nitride, that are used in machining operations such as turning, milling, and drilling. They are known for their high hardness, wear resistance, and heat resistance, which makes them well suited for machining materials such as steel, titanium, and nickel-based alloys. Ceramic inserts are also used in high-speed and high-temperature machining operations, as well as in applications where tool life and surface finish are important considerations.