Corner-chamfer end mills have a square nose with slightly angled corners that help distribute cutting forces evenly to prevent damage to the end mill and extend its life. They are rotated against a workpiece to create a flat-bottomed groove with slightly chamfered inside corners in milling applications where a specific radius size is not required. Each end mill has flutes on its cutting head that carry chips away from the workpiece to prevent damage to the end mill or workpiece. Corner-chamfer end mills are used on CNC or manual milling machines.