Use in general milling applications in medium to low-carbon steels, cast iron, non-ferrous light metals, and plastics. Double-end end mills economically increase productivity. 2-flute end mills are generally used for plunging, slotting, and heavy peripheral cuts. 3-flute end mills provide a compromise between the chip clearance of a 2-flute tool and the rigidity and wear resistance of a 4-flute tool; especially useful for many slotting operations. 4-flute end mills are most commonly used in profiling and in harder materials; stiffer construction results in minimal deflection. They also provide good surface finishes and wear-resistant characteristics for excellent size control.