Milling is a machining process in which a rotating milling tool removes material from the surface of a piece of stock. This process creates parts with a wide range of shapes and features, such as pockets and slots. Milling tools install on a CNC (computer numerical control) or manually controlled milling machine to perform milling tasks. End mills have cutting edges on their nose and sides and are used to create parts with complex shapes and profiles. Engraving tools cut letters, numbers, and designs on parts. Indexable and exchangeable-head tools accept replaceable cutting heads or indexable inserts. Milling cutters have teeth that remove material from a piece of stock to create parts with complex features and shapes. Mold and die milling tools have tapered sides and are used for creating molds and dies. Solid router bits make plunge and profile cuts in solid metal, plastic, composites, and wood.