Milwaukee SDS Plus MX4 Drill Bits have sy mmetrical 4 cutter geometry (4 x 90 deg) and perfect round holes for optimal anchor fitting. The high volume 4 flute geometry ensures the optimum removal of dust and debris. There is a centering tip for easy spot drilling with pinpoint accuracy. A welded solid carbide tip on 5 to 10 mm allows for wider flute entrance leading to increased speed. More carbide leads to a higher durability of the tip and higher lifetime. The 4 breaker points pulverize material more efficiently for faster drilling, Enhanced rebar guards for an improved resistance when hitting rebar. New variable flute design has a thin flute at the tip for maximum debris extraction, higher speed and less friction. Thick flute at the base for higher stability and reduced bit breakage.