Milwaukee SDS-PLUS MX4 5/8" X 6" X 8" Drill Bits with solid head carbide are designed to deliver up to 5 times longer life in concrete with rebar. These drill bits feature rebar guards for maximum durability when working with hard aggregate and rebar. The innovative 4-cutter design prevents lock-up, reducing downtime and increasing efficiency. A sharp centering tip ensures precise spot drilling in concrete and metal decking, while variable flutes help remove dust faster, reducing heat buildup and enabling up to 20% more holes per battery charge. Additionally, a wear mark indicator clearly shows the end of the bit's life and when it no longer meets ANSI requirements. The Milwaukee MX4 4-Cutter Drill Bits are the for concrete with rebar and masonry applications. Model Number: 48-20-7200