Milwaukee SDS-PLUS MX4 1-1/8" X 16" X 18" drill bits with solid head carbide are designed to deliver up to five times longer life in concrete with rebar. These bits feature rebar guards for maximum durability in tough aggregate and rebar, along with a 4-cutter design that prevents lock-up, reducing downtime during use. The sharp centering tip ensures precise spot drilling in concrete and metal decking. Variable flutes efficiently remove dust faster, reducing heat buildup and allowing you to drill up to 20% more holes per battery charge. Additionally, a wear mark indicator signals the end of the bit’s life and when it no longer meets ANSI requirements. The Milwaukee MX4 4-Cutter Drill Bits are i for heavy-duty concrete with rebar and masonry applications. Model Number: 48-20-7256