MILWAUKEE SDS Plus MX4 Drill Bits have symmetrical 4 cutter geometry (4 x 90°) & 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 ø 5-10 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 friciton. Thick flute at the base for higher stability and reduced bit breakage. Up to 20% more holes per battery charge vs 4 cutter drill bit in concrete and vs. previous generation.