Milwaukee SDS-PLUS MX4 7/8" X 10" X 12" drill bits feature solid head carbide construction that delivers up to five times longer life when working with concrete containing rebar. Designed with rebar guards for maximum durability in tough aggregate and rebar, these bits incorporate a 4-cutter design that prevents lock-up, minimizing downtime during use. The sharp centering tip ensures precise spot drilling in both concrete and metal decking. Variable flutes efficiently remove dust, reducing heat buildup and allowing for 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 reliable performance and extended durability. Model Number: 48-20-7230