CNC milling of aluminum can be difficult,as aluminium would stick to the flute and the chips would pack. Single Flute Carbide End Mill for aluminum have large flute to yield the maximum metal removal rates possible. They also feature eccentric grinding on the outside diameters of the bits to give them strength and stability, and large flute gullets for high metal removal rates. Aluminum Milling End Mill are available in square end and ball end mill geometries.