Milwaukee SDS-PLUS MX4 1/2" X 16" X 18" drill bits with solid head carbide are designed to deliver up to 5 times longer life when drilling through concrete with rebar. These bits feature a 4-cutter design with rebar guards that provide maximum durability in hard aggregate and rebar, preventing lock-up and reducing downtime. The sharp centering tip ensures precise spot drilling in concrete and metal decking. Variable flutes efficiently remove dust, reduce heat buildup, and enable up to 20% more holes per battery charge. 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 Milwaukee MX4 4-Cutter Drill Bits reliable performance and durability for demanding jobs. Model Number: 48-20-7377