Milwaukee SDS-PLUS MX4 1/4" X 4" X 6" drill bits feature a solid head carbide design that delivers up to 5 times longer life when working with concrete containing rebar. These bits are engineered with rebar guards to ensure maximum durability in tough aggregate and rebar conditions. The innovative 4-cutter design prevents lock-up, reducing downtime during use. A sharp centering tip allows for precise spot drilling in both concrete and metal decking. Variable flutes efficiently remove dust, reducing heat buildup and providing up to 20% more holes per battery charge. Additionally, a wear mark indicator signals when the bit has reached the end of its life and no longer meets ANSI standards. I for concrete with rebar and masonry applications, the Milwaukee MX4 4-Cutter Drill Bits combine durability, precision, and efficiency for professional-grade performance. Model Number: 48-20-7331