Milwaukee SDS-PLUS MX4 1/4" X 10" X 12" drill bits with solid head carbide deliver up to five times longer life when drilling through concrete with rebar. Designed with rebar guards for maximum durability in tough aggregate and rebar, these bits feature a unique 4-cutter design that prevents lock-up, reducing downtime during your projects. The sharp centering tip ensures precise spot drilling in both concrete and metal decking. Variable flutes efficiently remove dust, reducing heat buildup and enabling up to 20% more holes per battery charge. A wear mark indicator clearly shows when the bit has reached the end of its life and no longer meets ANSI standards. These MX4 4-cutter drill bits are the i choice for concrete with rebar and masonry applications, combining durability and performance for demanding jobs. Model Number: 48-20-7335