Milwaukee SDS-PLUS MX4 1/2" X 4" X 6" drill bits feature a solid head carbide design that delivers up to five times longer life when drilling into concrete with rebar. These bits are engineered with rebar guards to maximize durability in tough aggregate and rebar conditions. The innovative 4-cutter design prevents lock-up, reducing downtime for increased productivity. A sharp centering tip ensures 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 reliability and performance for demanding jobs. Model Number: 48-20-7371