Milwaukee SDS-MAX MX4 1-1/2" X 18" X 23" features the MILWAUKEE® MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bits with solid head carbide that deliver up to five times longer life when drilling through concrete with rebar. These bits are engineered with rebar guards to ensure maximum durability when working with hard aggregate and rebar. Designed by Milwaukee, the MX4™ 4-Cutter bits include sharp centering tips for precise spot drilling in concrete. The integrated 4-cutter design prevents lock-up in rebar, minimizing downtime during your projects. Optimized flutes efficiently remove dust faster, reducing heat buildup and allowing up to 15% more holes per battery charge. Each drill bit also features a wear mark indicator that shows when it no longer meets ANSI requirements. These MX4™ 4-Cutter Drill Bits are i for concrete with rebar and masonry applications, making them a reliable choice for demanding jobs. Model Number: 48-20-3988