Milwaukee SDS-PLUS MX4 1/2" X 10" X 12" 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 for maximum durability in tough aggregate and rebar conditions. The innovative 4-cutter design prevents lock-up, reducing downtime during use. A sharp centering tip ensures precise spot drilling in both concrete and metal decking. Variable flutes efficiently remove dust, reduce heat buildup, and provide 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 requirements. I for concrete with rebar and masonry applications, these drill bits reliable performance and durability. Model Number: 48-20-7374