Milwaukee SDS-PLUS MX4 3/8" X 4" X 6" Drill Bits feature a solid head carbide design that delivers up to five times longer life in concrete with rebar. Engineered with rebar guards for maximum durability in hard aggregate and rebar, these bits incorporate a 4-cutter design to prevent lock-up and reduce downtime. The sharp centering tip ensures precise spot drilling in concrete and metal decking, while variable flutes efficiently remove dust, reducing heat buildup and providing up to 20% more holes per battery charge. A wear mark indicator signals the end of the bit's life and when it no longer meets ANSI requirements. These drill bits are i for concrete with rebar and masonry applications, combining durability and performance to get the job done efficiently. Model Number: 48-20-7351